單項選擇題

Which of the following is a class A fire下列哪一項是A類火災(zāi)（）

A. Halon 鹵化烴(二氟二氯甲烷)
B. electrical 電氣類
C. liquid 液體類
D.common combustibles 普通的可燃物類

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單項選擇題

Devices that supply power when the commercial utility power system fails are called which of the following 當商業(yè)公用電源系統(tǒng)失效后，需使用下列哪一類供電設(shè)備？（）

A.power conditioners電壓穩(wěn)壓器
B.power filters電源濾波器
C.power dividers功率分配器
D.uninterruptible power supplies不間斷電源

單項選擇題

Which of the following is true about a "dry pipe" sprinkler system?下列哪一項關(guān)于干式噴水滅火系統(tǒng)的描述是正確的？（）

A .It reduces the likelihood of the sprinkler system pipes freezing.減少了噴水滅火系統(tǒng)的管被凍住的可能性
B .It is a substitute for carbon dioxide systems.二氧化碳滅火系統(tǒng)的替代品
C. It uses less water than "wet pipe" systems.比濕式滅火系統(tǒng)更節(jié)水
D .It maximizes chances of accidental discharge of water.增大的意外排水的可能性

Which of the following is a class A fire下列哪一項是A類火災(zāi)（）

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Devices that supply power when the commercial utility power system fails are called which of the following 當商業(yè)公用電源系統(tǒng)失效后，需使用下列哪一類供電設(shè)備？（）

Which of the following is true about a "dry pipe" sprinkler system?下列哪一項關(guān)于干式噴水滅火系統(tǒng)的描述是正確的？（）

Devices that supply power when the commercial utility power system fails are called which of the following 當商業(yè)公用電源系統(tǒng)失效后，需使用下列哪一類供電設(shè)備？（）

Which of the following is true about a "dry pipe" sprinkler system?下列哪一項關(guān)于干式噴水滅火系統(tǒng)的描述是正確的？（）