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【单选题】
使用钳形电流表应该注意( )。A.
测量前不需要估计电流的大小
B.
测量时钳口不必闭合
C.
测量完毕后将量程开到最大位置
D.
测量时可以转换电流量程
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举一反三
【单选题】Besides saving distance along the track line，another advantage of the Scharnow Turn over the Williamson Turn in a man overboard situation because ______.
A.
it is faster
B.
it can be used in both the immediate action and the delayed action situations
C.
in fog，if the turn is started as soon as the man goes over，the vessel will be at the point where he went over when the turn is completed
D.
it returns the vessel to the original track line on a reciprocal course
【简答题】6.Copies
of the book were ___________ free to each school in the district. A. distribute, B. distribution, C.distributive D./A. distribute B. distribution C.distributive D./
【单选题】金属元素和人体健康有很大关系．钾元素可以调节体液平衡，维持肌肉和神经的功能代谢．如果人体缺钾会出现肌肉不发达、心律不齐等症状．市场上出售的一种叫做果味钾的补钾药．其主要成分是枸椽酸钾（C 6 H 7 K 3 O 8 ）．下列有关对枸椽酸钾的说法正确的是（ ）
A.
该物质的一个分子中含有25个原子
B.
该物质中碳、氢、钾、氧元素的质量比是6：7：3：8
C.
该物质是由原子直接构成的
D.
该物质是由碳、氢、钾、氧四种元素组成的
【简答题】6.Copies
of the book were ___________ free to each school in the district. A. distribute, B.distribution, C.distributive D./A. distributed, B.distribution, C.distributive D./
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