单项选择题
Do you want the derrick adjusted upwards or downwards? （）
A. Top the derrick.
B. Yes, I do.
C. No, I don’t.
D. Sorry, I don’t know.
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A.powered
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When the weather becomes bad, the hatch covers will be （）.
A.closed
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After operation, drop the control levers into stowing hole, and （）the electric motor.
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