Z535钻床调试前的准备时，测量线路对地电阻是否（）3兆欧。

A、大于

B、小于

C、等于

D、大于等于

英汉互译。

I study English by listening to cassettes. (听录音带)

                       by studying with a group. (                )

                       by watching English programs on TV. (                )

                       by taking part in English classes after school. (                )

I study English ___________________________ (读英文杂志)。

                      ___________________________ (读教科书)。

                      ___________________________ (认真完成作业)。