輪機(jī)英語船舶輔助機(jī)械單項選擇題每日一練(2019.01.24)

來源：考試資料網(wǎng)

1 Which of the following statements is correct concerning heat transfer?（）

2 Centrifugal pumps can be designed with a number of impellers （） to attain a high final delivery pressure.

3 When securing a flash-type evaporator for an extended period of time, you should （）.

4 With reference to rules governing steering gear, which one of the following rules is incorrect? （）

5 If the suction pressure at the refrigeration compressor is below normal, the cause can be（）.