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單項(xiàng)選擇題

（） is the temperature at which a liquid fuel gives off sufficient vapor to form an ignitable mixture near its surface.

A.Setting point
B.Dew point
C.Flash point
D.Lean point

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單項(xiàng)選擇題

A combination combustible gas and oxygen indicator is an instrument that measures the（） of both combustible gas and oxygen; each is indicated on a separate meter.

A.purifies
B.combinations
C.concentrations
D.filters

單項(xiàng)選擇題

Deficiencies in the categories of Life-saving, Safety in General, Fire-fighting Appliances and Load Line （） approximately 66% of all deficiencies.

A.account as
B.account for
C.account to
D.account of

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