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问题 单项选择题

NRDS的基本病理类型是()

A．肺泡萎陷

B．肺气肿

C．肺出血

D．肺纤维化

E．肺不张

答案

参考答案：A

选择题
Li Ming, _____ to the concert enjoyed it very much.
A. I went with
B. with whom I went
C. with who I went
D. I went with him
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单项选择题

对动作条件为β>Arg(Z-B)>α的单相阻抗继电器，当α、β等于何值时，演变为电抗继电器？

A、β-α=180°

B、β-α=180°且α=180°、β=360°

C、β-α=180°

D、其它
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