给下列句子加上标点符号，使其表示各种不同的意思。

(1)这条鱼不大好吃

    ①                                                                                                  

    ②                                                                                                 

    ③                                                                                                  

(2)我同意他同意你怎么样 

    ①                                                                                                 

    ②                                                                                                  

离心泵的进出口压差较小时，机械密封选用以下（）进行冲洗。

A、自冲洗

B、间歇式冲洗

C、外冲洗

D、循环冲洗