輪機英語船舶電氣與船舶安全單項選擇題每日一練(2019.01.11)

來源：考試資料網(wǎng)

1 Portable carbon dioxide fire extinguishers should be sent ashore to be recharged （）.

2 Usually, emergency electricity supplies to on board（）

3 When an engine is starting and has got a sufficiently high speed, say about 20 rpm,（）

4 What is used for preventing pollution damage to the sea from ships?（）

5 Which kind of the following controllers is the most sophisticated controller?（）