磁粉探伤法可用于（）表面微裂纹探伤。 A.铝 B.铅 C.镍 D.铜_爱下问搜题

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问题单项选择题

磁粉探伤法可用于（）表面微裂纹探伤。

A.铝

B.铅

C.镍

D.铜

答案

参考答案：C

选择题

The old lady's hand shook frequently. She explained to her doctor ____ this shaking had begun half a year before, and ____, only because of this, she had been forced to give up her job.

A. when; how
B. how; when
C. how; how
D. why; why

多项选择题

当“所有A是B”为假而“有B不是A”为真时，A与B之间的外延关系是______

A．同一关系

B．A真包含B

C．A真包含于B

D．交叉关系

E．全异关系