单选题Vapor given off by a flammable liquid will burn when ignited provided（）A the vapor and air mixture is too richB it is mixed with certain proportions of airC the vapor is too little compared to the airD it is of heavy toxicity

The flash point of a liquid refers to the temperature ______.

A.at which a liquid will give off inflammable（易燃的） vapors

B.at which a liquid will burn steadily

C.at which a liquid will explode

D.that a liquid must reach before it will flow readily

A petroleum liquid has a flashpoint of 85℃．This liquid is in IMDG Code classed as a ______．

A.Flammable liquid

B.Nonflammable liquid

C.Inflammable liquid

D.Disflammable liquid

Any open flame can’t exist in this business building

A.Yes. We’ve removed all the flammable gas.

B.Yes. We’ve searched everywhere for flammable liquid

C.Yes. All the flammable liquid and gas have been removed already.

D.Yes. We’ve removed all the liquid, gas and wood which can be burned

Reid vapor pressure is ______．

A.exerted by liquid cargo on the sides of a tank

B.exerted by liquid cargo on a cargo hose body

C.the lowest temperature and pressure that will cause a flammable liquid to give off vapors

D.a measurement of the amount of flammable vapors given off by a liquid at a certain temperature

A petroleum liquid has a flash point of 85°F. This is a grade ______.

A.B flammable liquid

B.C flammable liquid

C.D combustible liquid

D.E combustible liquid

Camphor oil is classified as a ______．

A.Grade A flammable liquid

B.Grade C flammable liquid

C.Grade D combustible liquid

D.Grade E combustible liquid

A.flash point

B.fire point

C.upper explosive limit

D.lower explosive hmlt

A microbarograph is a precision instrument that provides a ______．

A.charted record of atmospheric temperature over time

B.charted record of atmospheric pressure over time

C.graphic record of combustible gases measured in an atmosphere

D.graphic record of vapor pressure from a flammable/combustible liquid