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【单选题】

Planetary aberration is due，in part，to（）.

A、refraction of light as it enters the Earth's atmosphere

B、rotation of the Earth on it's axis

C、the body's orbital motion during the time required for its light to reach Earth

D、a false horizon

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第1题
[单选题] Which of the devices listed is installed on a diesel engine to isolate some of the crankshaft vibrations caused by rotational and reciprocating forces?（）

A、Planetary gear set  B、Torsional vibration damper  C、Friction clutch  D、Air bladder clutch  

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第2题
[单选题] Diurnal aberration is due to（）.

A、motion of the Earth in its orbit  B、rotation of the Earth on its axis  C、the body's orbital motion during the time required for its light to reach the Earth  D、a false horizon  

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