单项选择题
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
点击查看答案&解析
相关考题
-
单项选择题
The lengthening of a crack formed in the shell plating of a ship may be prevented by （）.
A.welding brackets across both ends of the crack
B.chipping out and slot welding the entire crack
C.drilling a hole at each end of the crack
D.cutting a square notch at each end of the crack -
单项选择题
The fire extinguishing action of CO2 comes mostly from （）.
A.breaking the fire chemical chain reaction
B.smothering
C.cooling
D.isolating the heat from the fuel -
单项选择题
The amount of expansion space to be left in a fuel tank when fuel oil is being received, is determined by the （）.
A.quantity of fuel to be received
B.flash point of the fuel as it is received
C.fuel temperature as it is received
D.viscosity of the fuel being received
