采用变位齿轮相啮合可以配凑中心距。( )
参考答案：对
电解CuCl2溶液时，如果阴极上有1.6gCu析出，则阳极上产气体的体积（标况）约为
A．0.28L
B．0.56L
C．0.14L
D．11.2L
I'd like to find some information about the Great Wall. Could you teach me ______ to search the Internet. [ ]
A. how
B. when
C. where
D. what
