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單項(xiàng)選擇題

As a vessel sinks to a depth of 15 feet, the hydrostatic trip releases the life raft container from its cradle by（）.

A.breaking the weak link
B.releasing the tie-down strap
C.pulling the operating cord
D.releasing the CO₂ canister

單項(xiàng)選擇題

As an extinguishing agent,foam（）.

A.couducts electricity
B.should be directed at the base of the fire
C.is most effective on burning gases which are flowing
D.extinguishes by cooling oil fires blow ignition temperature