The thrust from the propeller to the hull of the ship is transferred by .A.tie rodB.thrust

一般分油机分离燃油的密度最高可达（）。

A.950kg/m3

B.991kg/m3

C.100kg/m3

D.1013kg/m3

emperature, it is necessary to expend mechanical work, heat, or electrical energy from an external source to achieve refrigeration.

A.lower/higher

B.shallower/deeper

C.larger/smaller

D.higher/lower

关于连杆弯曲变形的论述正确的是（）。

A.连杆在其摆动平面内承受的弯曲应力远大于与摆动平面垂直的平面，采用圆形截面杆身可提高其抗弯能力

B.连杆在其摆动平面内承受的弯曲应力远大于与摆动平面垂直的平面，采用工字形截面杆身可提高其抗弯能力

C.连杆在其摆动平面内承受的弯曲应力远小于与摆动平面垂直的平面，采用圆形截面杆身可提高相应方向的抗弯能力

D.连杆在其摆动平面内承受的弯曲应力远小于与摆动平面垂直的平面，采用工字形截面杆身可提高相应方向的抗弯能力

Auxiliary boilers are divided into several classifications, one of which is _____.

A.water-tube supercritical circulation

B.water-tube forced circulation

C.fire-tube controlled circulation

D.fire-tube express circulation

engine is the ________.

A.governor sensitivity

B.exhaust temperature

C.fuel injection pressure

D.speed of the can shaft

_____ which connect the bed plate, frame. sections and cylinder jackets into a single unit.

A.connecting rods

B.main bearing

C.column

D.tie rods

锅炉关闭蒸汽阀后完全燃烧，安全阀开启后，在规定时间内汽压应不超过_________。

A.最大允许工作压力5%

B.设计压力的5%

C.最大允许工作压力10%

D.设计压力的10%

关于离心泵的下列说法中错误的是________。

A.一般无自吸能力

B.不适于小流量高扬程

C.流量随工作扬程而变

D.允许吸上真空度较小

The presence of bubbles in a refrigeration system liquid line may _____.

A.promote refrigerant dehydration

B.be absorbed in the receiver

C.cause low condensing pressure

D.carry moisture and lead to corrosion

Our company has built a new ship in Hamburg and I am going to fly there to ______.

A.hand it over

B.take it over

C.carry it over

D.carry it out