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单选题
船用雷达是建立在无线电波在任何两种媒质的边界面上必然产生反射，以及（）等基本传播特性的基础上的。
A
无线电波的传播是沿地表进行的
B
无线电波的传播是沿直线进行的
C
无线电波的传播速度是常数
D
B+C
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Open-faced diamondB
Diamond with a crossC
CircleD
Rectangle
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单选题Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, （）to a maximum as the piston approaches top or bottom dead center and then （） back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.A
accelerates；deceleratesB
accelerates；acceleratesC
decelerates；deceleratesD
decelerates；accelerates
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单选题A casualty report of an intentional grounding of a ship is required under what condition?（）A
Under any conditionB
If the grounding lasts over 24 hoursC
If it creates a hazard to the environmentD
At the owner's discretion
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单选题某轮计划由12°00′.0N，83°41′.0W航行到74°29′.8N，19°12′.5E，则该轮的大圆航程为（）。A
490nmileB
3490nmileC
4910nmileD
4490nmile
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单选题The rotary motion of a diesel engine crankshaft is obtained from the up and down motion of the piston via the （）.A
camshaftB
reduction gearsC
rocker armD
connecting or piston rod
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整个活塞环圆周漏光弧度相加不得超过90°B
活塞环搭口处两侧30°范围内不得漏光C
相邻活塞环搭口应相应错开180°D
将活塞环置于缸套中部测量搭口间隙
考题
单选题Floors aboard ship are（）.A
also called decksB
vertical transverse plates connecting the vertical keel with the margin platesC
large beams fitted in various parts of the vessel for additional strengthD
found in passenger and berthing spaces only
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单选题To find the cause of a gasoline engine’s failure to start，you should（）.A
Break the joint in the fuel line at the engine and let the gas run in the bilgesB
Disconnect the wires at the spark plugs and make the spark jump the gapC
Prime the engine with ether through spark plug openingsD
Ventilate the space，then check the battery，spark plugs，carburetor，and fuel line
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单选题下列哪类情况的浸水，浸水后存在自由液面对船舶稳性的影响（）A
舱室顶部水密且位于水线以下，船体破损后整个舱室充满水；B
舱室顶部在水线以上，舱内与舷外水不相通，水未充满整个舱室；C
舱室顶部位于水线以上，舱内与舷外水相通。D
B和C
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engine logbookB
delivery docketC
store listD
maintenance book
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I~IIIB
II~IVC
I~IVD
I、II、IV
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活塞B
活塞裙C
活塞环D
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