过电流继电器的整定值必须调整适度，否则不能起到保护作用。
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引导接车时，列车以不超过（）的速度进站，并做好随时停车的准备。
A. 30km/h
B. 25km/h
C. 20km/h
D. 15km/h
为保证水分、二氧化碳的自清除，空气在切换式换热器冷端（）液化。
What is the primary use of the IBM Configuration & Options Guide （COG）？ （）
A. IBM System x ServicePac part number look up
B. Operating system and part number look up
C. General server information and part number look up
D. Software compatibility chart
Is considered to be one of the detainable deficiencies under the STCW Convention（）.
Absence, substantial deterioration or failure of proper operation of the cargo deck area fire protection on tanker
B. Absence, non-compliance or serious deterioration of lights, shapes or sound signal
C. Absence or failure of proper operation of the radio equipment for distress and safety communication
D. Absence in a watch of a person qualified to operate equipment essential to safe navigation, safety radio communications or the prevention of marine pollutio
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