单选题Compared to the amount of concentrated foam liquid used，the amount of low expansion mechanical foam produced is（）.A 97 times greaterB 94 times greaterC 10 times greaterD 2 times greater

The most effective way to apply a foam stream if the fire is on deck or is a runing fire, is to direct the stream ______.

A.onto the surface of the burning liquid

B.ahead of the burning liquid and bounce it on the fire

C.at the base of the burning liquid in a sweeping motion

D.just above the surface of the burning liquid

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、greater is the amount og goods consumed

B、greater amount of goods consumed

C、amount of goods is used greater

D、greater the amount of goods consumed

Firefighting foam is only effective when the foam _____.

A.penetrates to the bottom of the fire

B.is kept saturated with low-velocity water fog

C.mixes with the burning fuel oil

D.completely covers the top of the burning liquid

If a fixed foam firefighting system on a ship is not of the premix type，a sample of the foam liquid must be tested by ______.

A.a Coast Guard inspection officer

B.the safety man aboard the unit

C.the designated person in charge of the unit

D.the manufacturer or his authorized representative

When compared to a high-expansion foam，a low-expansion foam will ______．

A.Be dryer

B.Be lighter

C.Be less heat resistant

D.Not cling to vertical surfaces

A. is used to show the amount of cost expiration of intangibles

B. is the same as Depreciation Expense

C. is a contra asset account

D. is used to show the amount of cost expiration of nat