The rotating unit of a spilt windlass consists of a（） with shaped snugs to grip the anchor cablea mooring drum for paying out or letting go of mooring wires and warp end for warping duties.

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  A . metering B . timing C . rate of injection D . rate of distributio

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• A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has（）.

  A . error of perpendicularity B . side error C . prismatic error D . centering error

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• Which of the following is a feature of a unit of work?（）

  A . It applies to a single data server. B . It is a recoverable sequence of operations. C . Its value can be queried from the system catalog tables. D . It begins when the application connects to the data server.

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• The pressure head of a pump is given in the unit of （）.

  A . kg B . MPa C . meter fluid column D . None of the above is true

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• The amount of fuel delivered by a unit injector is controlled by the （）

  A . camshaft B . main spring C . rack position D . nozzle orifice size

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• What will be the phase angle relationship of a six-pole, three-phase, rotating field generator （）.

  A . 60 B . 120 C . 180 D . 360

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• Sidewise force of the propeller tends to throw a vessel’s stern to the right or left，depending on rotation. This force is caused by（）.

  A . back current from the rudder B . greater pressure on the right or left side of the propeller，depending on rotation C . lower pressure on the right or left side of the propeller，depending on rotation D . torque from the velocity and angle at which the surrounding water impinges upon the propeller blade

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• A centrifugal impeller consists of a number of vanes curving （） from the direction of rotation.

  A . backwards B . forwards C . upward D . downward

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• An acceptable method of measuring for the correct rotational force applied to the connecting rod and main bearing bolts, is to use a（）

  A . torque wrench B . monkey wrench C . pipe wrench D . slugging wrench

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• In order to change the direction of rotation of a D-Cmotor （） (1) the field leads must be changed (2) the input leads must be changed

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• The hot expanding gas rotates the blades of the exhaust turbine, thus （） a large of its power, （） drives the compressor.

  A . to give off；which B . giving off；which C . to give off；that D . giving off；that

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• Which of the following are components of a mechanical seal? （） (1) stationary ring (2) rotational ring (3) packing (4)spring

  A . (1), (2) and (3) B . (1), (2) and (4) C . (2), (3) and (4) D . None of the above

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• The rotor of the hydraulic motor rotates at a speed proportional to the （）.

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• When reassembling the bowl of a disk-type centrifuge, the bowl or locking ring is rotated （）.

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• The pressure head of a water pump is given in the unit of （）.

  A . kg B . MPa C . mH20 D . None of the above

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• The plunger in a jerk pump is rotated until the release port is uncoveredIf the port remains uncovered all of the time, which of the listed operations will occur?（）

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• High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.

  A . many thousand times B . between times C . one time D . at time

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• Which of the following will begin a new unit of work?（）

  A . The CONNECT statement B . The first FETCH of a cursor C . The BEGIN TRANSACTION statement D . The first executable SQL statement

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• High-speed rotation in a centrifugal purifier can produce a force （） the force of gravity.

  A . many thousand times larger than B . the same as C . many thousand times smaller D . none of the above

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• 3. What is the genre of Text A of Unit 3?

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• Lincoln, former president of the United States, is a conspicuous example of a poor boy who succeeded.

  A．sturdy B．obstinate C．permanent D．manifest

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• Which is the basic functional units of a myofibril?

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• The parallel-axis theorem for calculating rotational inertia about a rotational axis is , where is the rotational inertia about the COM, M is the total mass of the rigid body, and h is the verticle di

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• Which of the following does the author mention as a cause of changes in the role of the child in the United States？

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