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单项选择题

At the beginning of the film Schindler’s List, which one is not the identity of Oscar Schindler? A.
A German spy. B.
 A member of Nazi Party. C.
A fugitive.  D.
An opportunist.

判断题

轮对一般由车轴、车轮和传动大齿轮组成，通过间隙配合组装成一整体。