单选题As a sailor on duty you must know how to adjust derrick.（）A作为一名值班水手你必须懂得如何调整起货机。B作为一名值班水手你必须懂得如何调整吊杆。C作为一名值班驾驶员你必须懂得如何调整吊杆。D作为一名值班驾驶员你必须懂得如何调整起重机。
单选题
As a sailor on duty you must know how to adjust derrick.（）
A
作为一名值班水手你必须懂得如何调整起货机。
B
作为一名值班水手你必须懂得如何调整吊杆。
C
作为一名值班驾驶员你必须懂得如何调整吊杆。
D
作为一名值班驾驶员你必须懂得如何调整起重机。
参考解析
解析：
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As a sailor on duty you must know how to adjust derrick.（）A、作为一名值班水手你必须懂得如何调整起货机。B、作为一名值班水手你必须懂得如何调整吊杆。C、作为一名值班驾驶员你必须懂得如何调整吊杆。D、作为一名值班驾驶员你必须懂得如何调整起重机。
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问答题Let the children learn what all educated persons must some day learn, how to measure their own understanding, how to know what they know or do not know.