![](https://lstatic.shangxueba.com/sxbzda/h5/images/m_q_title.png)
[单选题]
25型车集便器的压力开关当压力高于()时、接触器关闭;当压力低于340kPa,它开启、切断系统。
A.450kPa
B.210kPa
C.410kPa
D.510kPa
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.450kPa
B.210kPa
C.410kPa
D.510kPa
第7题
A.100kPA
B.160kPA
C.180kPA
D.130kPA
第8题
A.120~250kPa
B.150~180kPa
C.120~210kPa
D.150~250kPa
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