輪機(jī)英語船舶輔助機(jī)械單項(xiàng)選擇題每日一練(2019.01.15)

來源：考試資料網(wǎng)

1 According to the way the steering gear is operated, the steering gear may be divided into: hand - steering, （） and automatic steering.

點(diǎn)擊查看答案

2 Which of the following pumps will build up a bursting pressure or stall their motors if the discharge valves are closed?（）
(1) gear
(2) centrifugal
(3) screw

點(diǎn)擊查看答案

3 One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.

點(diǎn)擊查看答案

4 Hydraulic cranes must be properly warmed-up before being operated because （）.

點(diǎn)擊查看答案

5 Through a （） pump, the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

點(diǎn)擊查看答案