单项选择题
请调高一下吊杆。（）
A. Lower the derrick, please.
B. Top the derrick, please.
C. Swing the derrick, please.
D. Adjust the derrick, please.
相关考题
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单项选择题
吊杆停用时，稳索必须要收起来。（）
A. When the derrick is stopped, the guy must be stowed.
B. When the derrick is stopped, the guy must be topped.
C. When the derrick is stopped, the guy must be lowered.
D. When the guy is stopped, the derrick must be stowed. -
单项选择题
作为一名值班水手，你必须懂得如何调整吊杆。（）
A. As an officer on duty, you must know how to adjust derricks.
B. As a sailor on duty, you must know how to adjust derricks.
C. As a sailor on duty, you must know how to operate cranes.
D. As an officer on duty, you must know how to operate cranes. -
单项选择题
很多船上在每个舱口处都有两个吊杆及两台起货机。（）
A. Many ships have two derricks at each hatch.
B. Many ships have two winches at each hatch.
C. Many ships have two derricks and two winches at each hatch.
D. Many ships have two derricks and two winches at each hatch cover.
