航海英語燃燒與爆炸單項選擇題每日一練(2019.01.18)

來源：考試資料網(wǎng)

1 Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.

2 Automatic fire dampers in ventilation systems are operated by use of（）.

3 During a training exercise a submarine indicating that a torpedo has been fired will send up smoke from a float. The smoke’s color will be（）.

4 Each part of the fire-main system located on an exposed deck must be（）.

5 Each hose in the fuel transfer system for helicopter refueling must meet the standards of the（）.