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电路原理研究的电路是()

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零序过电流保护采用的动作时间特性是( )。

A. 定时限特性
B. 反时限特性
C. 可变时限特性
D. 阶梯时限特性

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当零序综合阻抗大于正序综合阻抗,进行零序过电流保护远后备灵敏度校验时其校验条件需要考虑的故障类型是:( )。

A. K(1)
B. K(1,1)
C. K(2)
D. K(3)

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零序过电流保护在故障越靠近电源端时,短路电流越大,切除故障的时限反而越长,是其主要缺点。( )

A. 对
B. 错

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4.1.3 However, [when we look at（观察） the 100 billion stars (恒星）in our galaxy(银河)(the Milky Way),and 100billion galaxies（星系）in the observable Universe（可见宇宙）], it seems inconceivable(难以置信的)that at least one of these planets does not have a life form on it.The trunk in the above sentence is__________.

A. SVP-It（形式主语） seems inconceivable.
B. SVO-We look at the 100 billion stars and 100billion galaxies.
C. SVO- It（形式主语） seems inconceivable.
D. SVO-It least one of these planets does not have a life form.

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