水喷射泵在未达临界流量比之前，若其他条件不变，则________。A.排出压力升高，则引射流量增加B.吸入

The rate of fuel injection in a diesel engine cylinder depends primarily on _____.

A.the size of the holes in the fuel nozzle

B.timing of the pump

C.supply pressure to the pump

D.shape of the combustion chamber

Which one is true as regards to the hardhat according to the passage?

A.It needs not to be regularly replaced

B.It is designed to protect from possible impact

C.It is required to be worn on deck at all times by all ships

D.fibreglass hardhat should not be used on board ships

关于锅炉燃烧器管理的下列说法中，错误的是_________。

A.雾化片结焦不能用金属工具清除

B.火焰有黑色条纹表明油中有杂质

C.喷油量超过额定值太多可将雾化片研薄后使用

D.喷出的油雾外缘应与喷火口相切

s, which of the listed types of pistons are used in modem low pressure air compressors?

A.Differential

B.Trunk

C.Barrel

D.Valve-in-head

热力膨胀阀温包所充的易挥发液体因_________而异。

A.阀容量大小

B.所用蒸发器温度高低

C.系统所用制冷剂不同

D.阀为内平衡或外平衡式

emptyWhat is the meaning of “directly” in the sentence above?

A.at once

B.as soon as

C.quickly

D.straight

Some diesel engines are supercharged with a ____.

A.slam charger

B.turbocharger

C.fuel atomizer

D.fuel injector

炉膛容积热负荷的常用单位是_________。

A.kJ/m3

B.kW/m3

C.kW/m3h

D.kcal/m3

制冷压缩机吸气腔最低处所开的通轴箱的孔道，作用不包括_________。

A.让吸气带回的滑油返回曲轴箱

B.必要时抽空曲轴箱

C.抽走漏入曲轴箱的制冷剂

D.减少吸气压力波动

A faulty injection in one cylinder of an operating diesel engine can be located by ____.

A.cutting out individual injectors and noting engine performance

B.checking lube oil temperature

C.checking cam position

D.using a timing light