A.will remove all the toxic fumes from the air
B.has the greatest cooling ability
C.will leave no harmful residue
D.completely removes combustible vapors from the air
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A.soda acid
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C.CO2
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A.stopping the flow of gas
B.reducing the chemical chain reaction
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A.burner valve
B.root valve
C.quick closing valve
D.oil return valve
A.paint thinner in an open can
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（） is not installed on the main switchboar.
The condensers located in various stages of a flash evaporator are cooled by（）
（）connectors hold best if a wire is accidentally pulled or a connection becomes loose.
The shipboard oil pollution emergency plan will be invalid after （）
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