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航海英語燃燒與爆炸單項選擇題每日一練(2019.01.14)

來源：考試資料網(wǎng)

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

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2 A fire main system must have enough fire hydrants so that each accessible space may be sprayed with（）.

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3 Backfire flame arrestors are installed on（）.

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4 A carburetor is required to have a safety device called a(n)（）.

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5 Automatic fire dampers in ventilation systems are operated by a（）.

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