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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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