2150年世界各地区人口数从高至低排列，处于第三位的大洲是（）。

A.jacket water outlet

B.cooling water pump outlet

C.heat exchanger outlet

D.expansion tank atmospheric vent

An inert gas system installed on a tanker is designed to ______.

A.aid in the stripping and cleaning of cargo tanks

B.increase the rate of discharge of cargo

C.force toxic and explosive fumes from a cargo tank to vent to the outside atmosphere

D.lower the oxygen levels inside cargo tanks，making explosion nearly impossible

A.cylinder head water outlet header

B.cylinder jacket inlet main

C.heat exchanger inlet connection

D.jacket water pump suction line

A.raw water pump discharge

B.expansion tank outlet

C.cooling water heat exchanger

D.outlet engine jacket water outlet

A.pump from the damaged tank

B.fight a fire

C.abandon ship

D.use the crossover system

All of the following are true EXCEPT ______.

A．the atmosphere is important to none.

B．a great deal of damage from the sun's deadly rays would be done to us, if there were no at mosphere.

C．the atmosphere, as the author described, is the roof under which man can live safely on Earth.

D．electricity in the atmosphere is being studied from every aspect.

A．vent

B．declare

C．utter

D．shout

A.Overflow valve

B.Reducing valve

C.Balancing valve

D.Reducing valve or balancing valve

All of the following are true Except ______.

A．the atmosphere is important to none.

B．a great deal of damage from the sun's deadly rays would be done to us, if there were no atmosphere.

C．the atmosphere, as the author described, is the roof under which man can live safely on Earth.

D．electricity in the atmosphere is being studied from every aspect.