航海英語液化氣體與IGC規(guī)則單項選擇題每日一練(2019.01.20)

來源：考試資料網(wǎng)

1 Gasoline fumes tend to（）.

2 On a hydrocarbon flammability chart the line which extends from 0% to 21.8% oxygen，lying tangent to the flammability range，is called the（）.

3 LFG tank and pipeline maintenance should include（）.

4 Before starting a gasoline engine on a motorboat，you should make sure for safety that（）.

5 When fueling has been completed（）.