正确答案: C

软填料轴封

题目：往复泵的活塞杆密封一般选用( )。

解析：C

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举一反三的答案和解析：

[单选题]In order to achieve greater dehumidification with an air conditioning system, you should ____.Ⅰ.reduce the cooling coil Ⅱ.temperature increase the re-heater temperature

BothⅠandⅡ

[单选题]Injectors for use with heavy fuel oil must be cooled by either water or light oil to_____.

avoid carbonization of the nozzle tips

[单选题]氢氧化钠俗称?()

火碱、烧碱、液碱

[单选题]进港程序和安排应向有关()提出申请和获得许可一事，由当地的船方代理办理。

主管机关

[单选题]晕船时最好采取哪种方法?

卧床休息