《焊工考核细则》中摩擦焊焊接方法代号为（）

A.EGW

B.PAW

C.ESW

D.FRW

Fire in an engine compartment is best extinguished with carbon dioxide gas (CO₂) and by（）.

A.closing the compartment except for the ventilators

B.completely closing the compartment

C.leaving the compartment open to the air

D.increasing the air flow to the compartment by blowers