單項(xiàng)選擇題

An advantage of a dry chemical over a carbon dioxide fire extinguish is its（）.

A.greater range
B.effective on all types of fires
C.cleanliness
D.All of the above

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單項(xiàng)選擇題

An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.

A.lack of toxicity
B.the multipurpose extinguishing ability
C.bum-back protection
D.cooling ability

單項(xiàng)選擇題

An advantage of nylon rope over manila is that nylon rope（）.

A.can be used in conjunction with wire or spring-lay rope
B.can be stored on decks exposed to sunlight
C.can hold a load even when a considerable amount of the yarns have been abraded
D.gives audible warning of overstress whereas manila does not