你可能感興趣的試題

單項選擇題

Which of the following gases represents the greatest threat to personnel safety in an engine room where the exhaust is leaking from a diesel engine?（）

A.Carbon dioxide
B.Carbon monoxide
C.Carbon trioxide
D.Hydrogen sulfide

單項選擇題

Seawater may be used for drinking water （）.

A.at a maximum rate of two ounces per day
B.after mixing with an equal quantity of fresh water
C.if gather during or immediately after a hard rain
D.under no circumstance