輪機(jī)英語船舶輔助機(jī)械單項(xiàng)選擇題每日一練(2019.01.09)

來源：考試資料網(wǎng)

1 The defective places in the furnace （） with fire bricks.

2 A refrigeration system contaminated with moisture can be affected by （）.

3 As for a oil-fired boiler too much air would indicated by （）.

4 Large pipes or down-comers are fitted between the steam drum and （） to ensure good natural circulation of water.

5 The water level showing in a boiler water gauge glass is usually （） during working.