The speed at which a storm centre moves is the（）.

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  A . Ground speed B . Boarding speed C . Relative speed D . Speed of the vessel

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• Which of the following conditions guarantees that a broadcast storm cannot occur？（）

  A . a native VLAN mismatch on either side of an 802.1Q link B . BPDU filter configured on a link to another switch C . Spanning Tree Protocol enabled on both Layer 2 and multilayer switches D . PortFast enabled on all access and trunk port

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• The Navigation Rules state that a vessel shall be operated at a safe speed at all times so that she can be stopped within（）.

  A . the distance of visibility B . 1/2 the distance of visibility C . a distance appropriate to the existing circumstances and conditions D . the distance that it would require for the propeller to go from full ahead to full aster

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• The possibility of damage from operating a diesel engine at critical speeds is reduced by the use of（）.

  A . an isochronous governor B . elastic engine mounts C . a vibration damper D . a cast iron bed plate with good flexible qualitie

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• According to Regulations, a power driven auxiliary steering gear for a vessel capable of a 12 knot service speed, must be able to meet the rudder movement requirements at which of the minimum vessel speeds listed below?（）

  A . 6 knots B . 7 knots C . 9 knots D . 12 knot

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• According to Regulations, a power driven auxiliary steering gear for a vessel capable of a 20 knot service speed, must be capable of producing a rudder movement at which of the minimum speeds listed below?（）

  A . 7 knots B . 10 knots C . 15 knots D . 20 knot

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• Increasing the speed of a rotary pump above its rated speed will result in which of the following conditions to occur?（）

  A . Loss of suction B . Increased clearances C . Decreased clearance D . Decreased slippage

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• A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a （）.

  A . slow-speed diesel B . medium-speed diesel C . high-speed diesel D . constant-speed diesel

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• The device used to limit engine torque at various engine speeds is called a （）

  A . speed limiting governor B . variable speed governor C . constant speed governor D . load limiting governor

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• The term “moderate speed” was previously interpreted as meaning a speed which would enable a vessel （）within half the range of visibility.

  A . stopping B . being stopped C . to stop D . to be stopped

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• If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.

  A . 525 RPM B . 775 RPM C . 1550 RPM D . 1800 RPM

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• （）is placed in the front of the ship under the water,which eases berthing or ma-noeuvering sideways at slow speed.

  A . The bulbous bow B . The anchor C . The bow thurster D . The propeller

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• （） thrust and resistance equal each other, the ship always travels at a constant speed.

  A . As long as B . As far as C . As well as D . Unle

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• If a cam-controlled engine has a normal injection pressure at rated speed,the injection pressure will be（）at slow speed.

  A . a little lower B . a little higher C . too low D . exactly the same

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

  A、flow of oil B、pressure of oil C、flow and pressure of oil D、temperature of oil

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• The term MODERATE SPEED was previously interpreted as meaning a speed which would enable a vessel（）within half the range of visibility.

  A . stopping B . to stop C . to be stopped D . to be stopping

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• Every vessel shall proceed at a safe speed（）the prevailing circumstances and conditions

  A . adapted to B . used by C . liable to D . adaptation to

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• Which condition suggests that your present position lies in the navigable semicircle of a tropical storm（）.

  A . A backing wind B . A veering wind C . Sustained gale force winds D . A strong wind that maintains a constant speed and directio

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• A diesel engine experiences a sudden loss in speed, accompanied by black exhaust smoke, with the fuel rack at maximum, and speed remaining below normal the probable（）

  A . engine overload B . leaky valves C . stuck or broken piston rings D . low air injection pressure

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• The idiom “ 白驹过隙 ” means to run at a high speed.

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• A technician is troubleshooting a WLAN card in a laptop. The wireless infrastructure is 802.11g.The WLAN card is showing connected at 11Mbps.Which of the following would be the BEST reason why the WLAN card is performing at that speed？（）

  A. The WLAN card is 802.11g. B. The WLAN card is 802.11b. C. The WLAN card is 802.11n. D. The WLAN card is 802.11a.

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• The term "moderate speed" was previously interpreted（解释） as meaning a speed which would enable a vessel ______within half the range of visibility.

  A.stopping B.being stopped C.to stop D.to be stopped

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• A big storm ______ the town at 2 p.m., leaving a trail of damaged houses, injured people and dead animals.

  A、attacked B、struck C、blew D、came to

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