【名词&注释】
驾驶台(driving platform)、必须有(must have)、机械制动器(mechanical brake)、救生圈(buoy)
[单选题]关于对船舶克令吊回转机构液压系统的设计要求，以下说法中不恰当的是( )。
A. 对执行元件两侧主油路限压保护的要求相同
B. 必须有限制执行元件任一方向运动速度过快的措施
C. 无须设机械制动器
D. 无须采取限制功率的措施
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举一反三：
[单选题]Portable carbon dioxide fire extinguishers should be sent ashore to be recharged
A. when the remaining charge volume is less than 90 percent of the required volume
B. at each inspection for certification
C. at each annual inspection
D. when the weight loss exceeds 10% of weight of charge
[单选题]_______can cause oil flow from water outlet of the oil purifier.
A. Oil inlet valve opening too quickly
B. Oil temperature little higher than normal
C. Diameter of gravity disc too small
D. Viscosity of oil little lower than normal
[单选题]配有自亮灯浮和自发烟雾信号的救生圈(buoy)在驾驶台每舷至少应有_______。
A. 1个
B. 2个
C. 4个
D. 3个
[单选题]In a diesel engine closed freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the __.
A. suction pressure regulator
B. thermostatic bypass valve
C. sea water temperature
D. water level in the expansion tank
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