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怎样进行体育摄影?

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A vessel servicing a pipeline during the day shall display().

A. three black shapes in a vertical line; the highest and lowest are balls,and the middle one is a diamond
B. three shapes in a vertical line; the highest and lowest are red balls,and the middle one is a white diamond
C. three black balls in a vertical line
D. two black balls in a vertical line

风电场采用单母线接线方式的优、缺点各有哪些?

下列属于特高压交流系统输电能力电压稳定计算方法的是()。

A. 静态电压稳定计算
B. 大扰动暂态电压稳定和动态电压稳定计算
C. 特征根判别法
D. 中长期电压稳定计算

CRH5型动车组换端保持操作时,操纵台上的所有开关应归到零位。

A. 正确
B. 错误

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