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By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.
A . a floodlight
B . two red lights in a vertical line
C . a single red light
D . any visible light
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Which of these commands can you use to show if an operational Catalyst switch port is set for autonegotiation of speed and duplex when running Cisco IOS software?（）
A . show port network
B .
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If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.
A . high steam pressure in the boiler
B . abnormally high feed water temperature
C . abnormally high boiler water temperature
D . steam demand exceeding feed pump capacity
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Which of the following will occur if an operator types the command vi file.out?（）
A . If the file exists it will be opened for editing. If the file does not exist an error message will be displayed.
B . If the file exists it will be opened for editing. If the file does not exist a new file with the name file.out will be created and opened for editing.
C . If the file exists an error message will be displayed. If the file does not exist a new file with the name file.out will be created and opened for editing.
D . If the file exists the operator will be asked whether to open the file or overwrite the file. If the file does not exist a new file with the name file.out will be created and opened for editing.
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The pump used to send the bilge water into the oily water separator（）the mixture because this might create finer oil particles.
A . should agitate
B . should not agitate
C . should mix up
D . should not add u
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What command will an operator use to check if the system has NFS3 filesystems currently defined?（）
A . lsnfs3
B . lsnfs -v 3
C . lsfs -v nfs3
D . lsfs -t nfs3
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When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.
A . air chamber
B . head lank
C . primer
D . prime mover
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If an emergency pump control is used as the emergency shutdown on a tanker，it must（）.
A . stop the flow of oil at the main deck manifold
B . prevent the oil from leaving the shore facility
C . prevent the oil from siphoning through the pump
D . None of the above
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Which ports must be left open if an administrator plans to perform Dynamic LPAR operations？（）
A . port 21（ftp）：tcp and port 657（rmc）：tcp
B . port 22（ssh）：tcp and port 657（rmc）：udp
C . port 657（rmc）：tcp and port 657（rmc）：udp
D . port 161（snmp）：tcp and port 161（snmp）：ud
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The simplest method to use for determining if a centrifugal pump is operating as designed, is to （）.
A . closely observe the pump discharge temperature
B . close off the discharge valve, and watch for a rise in pressure
C . momentarily close off the suction valve, and watch for a rise in pressure
D . use a clamp on ammeter and compare the readings to past record
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A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.
A . the four-way control valve failing to shift
B . the bleeder valve sticking in the open position
C . cold hydraulic fluid
D . a clogged air vent falter on the oil reservoir
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The minimum number and capacity of bilge pumps and fire pumps and their distributing within the ship is governed by （）.
A . Classification Society Rules
B . National requirements
C . The IMO International Convention for the Safety of Life at Sea
D . All of the above
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If a bilge pump failed to build up discharge pressure, you should check for （）.
A、The requirement for the oil content of bilge water discharged is 15 ppm.
B、No discharge in sensitive waters.
C、Any discharge in sensitive waters.
D、International, national or local requirements have to be observed.
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An individual injection pump is designed for variable beginning and constant ending of injectionFor diesel engines operating at constant speeds, the start of injection will（）
A . advance as the load increases
B . retard as the load increase
C . remain unchanged regardless
D . always occur at top dead center
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The fire pumps must be capable of delivering a total quantity of water at a defined head, not less than （） of the total bilge pumping capacity.
A . one-third
B . two-thirds
C . one-fourth
D . two-fourth
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An independent bilge suction is required for （）.
A . ballast tanks
B . sludge tanks
C . machinery space bilges
D . cargo hold bilge
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If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.
A . trick wheel
B . accumulator
C . standby pump
D . telemotor
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You are unable to pump out the aft starboard engine room bilge well that is fouled, with one foot of water over the top of the bilge well, what action should be carried out?（）
A . Send the wiper into the well with only a scoop and pail
B . Remove the bilge manifold valve and attempt to back flush the line
C . Simultaneously operate all available bilge pumps
D . It is only necessary to transfer half the contents of a drum of degreaser into the bilge well
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On modern ships, centrifugal pump with a self-primer has replaced reciprocating pump as bilge pump because（）
A . centrifugal pump is cheaper than reciprocating pump
B . the size of centrifugal pump with same capacity is smaller than that of reciprocating pump
C . centrifugal pump makes maintenance easier than reciprocating pump does
D . all of the above
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A centrifugal bilge pump requires priming （）.
A . primarily to lubricate the shaft seals
B . due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller
C . to initially unload the pump by having its head pressure equal to discharge pressure
D . in order to overcome the potential energy of water in the discharge line
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If you were operating a centrifugal water service pump with worn wearing rings, the （）.
A . pump would be very noisy
B . pump would vibrate excessively
C . pump would develop insufficient flow
D . stuffing box would leak excessively
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As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: （） (1) secure oil to fires (2) increase feed pump pressure
A . （1）
B . （1）and（2）
C . （2）
D . neither（1）nor（2）
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As for an oil-fired boiler if at a normal steaming condition and water goes out of sight in gauge glasses the action you should take is: (1) secure oil to fires; (2) increase feed pump pressure.
A.(1)
B.(1) and (2)
C.(2)
D.neither (1) nor (2)
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Surgeons will soon be able to enter the eye to carry out operations—at least in a virtual sense. Techniques derived from virtual reality the computer system that immerses operations in an artificial computer-generated world—will allow surgeons to feel as if he could see the in side of the eye during an operation, creating the illusion that they are actually there.
Researchers at the Biorobotics (生物机械技术)Laboratory of McGill University in Montreal are building a robot , known as Micro Surgery robot-1(MSR- I for short), that will perform. delicate operations under the control of a human surgeon. The robot is specifically designed for performing eye surgery but could have other applications, such as the removal of brain tumors. The system could also be used to allow surgeons and their students to practise simulated surgery that feel like the real thing- without the real consequences for the patients.
During the operations, the surgeon manipulates a set of control known as the master. These are connected through a high- performance computer to the robot. Both the master and the robot have two limbs, When the surgeon moves the masters' limbs, the robots limbs move in exactly the same way, except that the movements can be scaled down as much as a thousand times. This will eliminate hand tremor and poor accuracy and thus reduce the damage to the eye that can occur with present microsurgery techniques. Each of the robots limbs has a minimum movement of one micrometer---more than one hundred times the precision of the human hand.
The computer also creates a three - dimensional robot' s eye view of the inside of the eye that the surgeon can see by wearing a virtual reality helmet (虚拟现实头盔) that has a small lens in front of each eye.
To provide the surgeon with such a realistic experience, MSR-I must be able to move rapidly, but this requires extremely fast computing. To handle the computational demands of instant interaction, the McGill team is constructing its own parallel-processing computer., It is al so studying areas such as muscle mechanism, artificial intelligence and optics, and has a already built another micro robot MR- I, capable of manipulating a single living cell.
Although commercial applications of the new system are not expected for several years, its basic mechanical components will be ready for testing in a few months, "The day when micro robots will be able to perform. surgery without human intervention is many years away," says Hunter, "in the meantime , a system such as MRS-I is a necessary precursor."
The so-called "virtual reality "mentioned in this passage is actually.
A．a surgical tool used for operations
B．a computer system used to produce life- like illusions
C．a new kind of applications in a visual technology.
D a way to carry out operations in a visual sense
