单项选择题

A tow can override its tug as a result of（）.

A.a mechanical breakdown on the tug
B.adverse tidal current conditions
C.the tug reducing its speed
D.All of the above

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单项选择题

A time diagram is a diagram on the plane of the（）.

A.celestial meridian
B.celestial equator
C.celestial horizon
D.principal vertical circle

单项选择题

A time diagram is a diagram of the celestial sphere as observed from above the（）.

A.south celestial pole
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单项选择题

A thrust block is designed to（）.

A.transmit the thrust of the engine to the propeller
B.transmit the thrust of the propeller to the vessel
C.absorb the shock of wave pressure at the bow
D.be placed between the engines and the foundation to absorb the vibration