單項(xiàng)選擇題

A definite advantage of using water as a fire extiguishing agent is its characteristic of（）.

A.alternate expansion and contraction as water in a liquid state becomes a vapor
B.absorption of smoke and gases as water is converted from a liquid to a vapor
C.rapid contraction as water is converted from a liquid to a vapor
D.rapid expansion as water absorbs heat and changes to steam

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單項(xiàng)選擇題

A design modification of an anchor chain which prevents kinking is the（）.

A.detachable link
B.stud link
C.Kenter link
D.connection link

單項(xiàng)選擇題

A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a（）.

A.flame stopper
B.flame screen
C.flame filter
D.flame restrictor

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A definite advantage of using water as a fire extiguishing agent is its characteristic of（）.

你可能感興趣的試題

A design modification of an anchor chain which prevents kinking is the（）.

A device fitted over the discharge opening on a relief valve consisting of one or two woven wire fabrics is called a（）.

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