單項選擇題

作為一名值班水手,你必須懂得如何調(diào)整吊桿。()

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.

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