單項(xiàng)選擇題

Devices that supply power when the commercial utility power system fails are called which of the following 當(dāng)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

你可能感興趣的試題

Which of the following is true about a "dry pipe" sprinkler system?下列哪一項(xiàng)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

單項(xiàng)選擇題

Which is the last line of defense in a physical security sense下列哪一項(xiàng)是物理安全感知的最后一道防線？（）

A.perimeter barriers邊界圍墻
B.exterior barriers外墻
C.interior barriers內(nèi)部隔離墻
D.people人

Devices that supply power when the commercial utility power system fails are called which of the following 當(dāng)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？（）

你可能感興趣的試題

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

Which is the last line of defense in a physical security sense下列哪一項(xiàng)是物理安全感知的最后一道防線？（）

Devices that supply power when the commercial utility power system fails are called which of the following 當(dāng)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(xiàng)關(guān)于干式噴水滅火系統(tǒng)的描述是正確的？（）

Which is the last line of defense in a physical security sense下列哪一項(xiàng)是物理安全感知的最后一道防線？（）