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20. 下列两设备,均须安装旁路调节流量装置是( )。
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20. 下列两设备,均须安装旁路调节流量装置是( )。
A、离心泵与往复泵
B、往复泵与齿轮
C、离心泵与旋涡泵
D、离心泵与齿轮泵
时间:2021-09-01 19:09
关键词:
青书学堂
延安大学
基础化学(专升本)
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B
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