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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1.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
2.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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