作为一名值班水手，你必须懂得如何调整吊杆。（）<br>A:As an officer on duty, you must know how to adjust derricks.<br>B:As a sailor on duty, you must know how to adjust derricks.<br>C:As a sailor on duty, you must know how to operate cranes.<br>D:As an officer on duty, you must know how to operate cranes.

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.

出自：船舶水手证

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