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

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

A.south celestial pole
B.north celestial pole
C.observer's meridian
D.Greenwich meridian

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

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A thin，whitish，high cloud popularly known as “mares’ tails” is（）.

A.altostratus
B.stratus
C.cumulus
D.cirrus