【名词&注释】
覆盖层(overburden)、强制性规定(mandatory provision)、水蒸汽(steam)、中国船级社(china classification society)、灭火机(fire extinguisher)
[单选题]下列属于中国船级社规定的轮机入级符号是______。
A. ★ZC
B. ★CSM
C. ★ACS
D. ★CSA
查看答案&解析
举一反三：
[单选题]The correct procedure for giving an auxiliary boiler a bottom blow, is to begin .
A. when the boiler has been secured long enough for most solids to settle
B. when the boiler has been cooled to ambient temperature
C. only after raising the water level to within 0.5 inch of the high water cutout only
D. after bypassing the low pressure
[单选题]IBC规则的要求通过SOLAS公约第()章成为强制性规定。
A. 6
B. 7
C. 8
[单选题]He and she ________ English seamen.
A. is
B. are
C. be
D. am
[单选题]下列灭火方法不属于窒息法的是：_______。
A. 氮气罩住燃烧物，冲淡氧气含量比例。
B. 泡沫形成致密覆盖层，隔绝空气。
C. 水蒸汽形成隔离层，隔绝空气。
D. 1211灭火机(fire extinguisher)灭火。
[单选题]The amount of fluid delivered by a positive displacement pump can be regulated by _____.
A. throttling the pressure line
B. changing the speed of the driving rotor
C. either A or B
D. None of the above is tree
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