輪機英語船舶輔助機械單項選擇題每日一練(2019.01.18)

來源：考試資料網(wǎng)

1 Which of the following statements is correct relative to distillation plant operation?（）

2 The refrigeration system low pressure cutout switch is actuated by （）.

3 Sub-cooling is a method of reducing the temperature of the liquid refrigerant below its （）.

4 The tube in a boiler should be blinded if found （）.

5 Which of the following statements is true concerning centrifugal pumps?（）