单项选择题

普通螺栓联接的螺栓与螺孔之间有间隙。

A．对
B．错

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单项选择题

What is probably UNTRUE of Sylvia and her life?
A、She is nine years old.
B、She is born in the woods.
C、She enjoys her life with Mrs. Tilley in a secluded farm.
D、Mistress Moolly is the girl’s loyal companion.

单项选择题

图是相同条件下实拍的干涉、衍射图，则【】