【名词&注释】
往复泵(reciprocating pump)、氢氧化钠(sodium hydroxide)、海事局(marine administration)、主管机关(competent authorities)、0形密封圈、唇形密封圈(lip sealing ring)、活塞杆密封(piston rod packing)
[单选题]往复泵的活塞杆密封(piston rod packing)一般选用( )。
A. 唇形密封圈(lip sealing ring)
B. 0形密封圈
C. 软填料轴封
D. 机械轴封
查看答案&解析
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举一反三：
[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
A. Ⅰonly
B. Ⅱonly
C. BothⅠandⅡ
D. NeitherⅠnorⅡ
[单选题]Injectors for use with heavy fuel oil must be cooled by either water or light oil to_____.
A. prevent heat corrosion to internal components
B. increase fuel delivery rate and economy
C. prevent pre-ignition
D. avoid carbonization of the nozzle tips
[单选题]氢氧化钠俗称?()
A. 火碱、烧碱
B. 液碱
C. 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。
A. 船旗国
B. 主管机关
C. 海事局
[单选题]晕船时最好采取哪种方法?
A. 多活动
B. 站在船的高处通风
C. 卧床休息
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