问答题

侵入体的相一般划分为_____。

A.边缘相
B.过渡相

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单项选择题

In America history, there was a time when it was a common ( ) to separate the black from white in public places.

A.practice
B.sense
C.response
D.reflection

两侵入体间的非侵入接触有哪些表现形式_____。

A.突变对接
B.渐变过渡