Why couldn't the newspaper carrier get out of her car to help?
A.Because she didn't want to.
B.Because she couldn't walk.
C.Because she was so scared that she couldn't move.
第7题
A.操作阀门时应缓开缓关
B.同时操作多个阀门时应注意操作顺序
C.操作球阀可以半开或半关
D.开启有旁通阀门的较大口径阀门时若两端压差较大,应先打开旁通阀进行调压,然后再开主阀
E.操作阀门必须带上橡胶手套
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