單項選擇題

Under what conditions would the use of a Class C fire extinguisher be preferable to a Class A extinguisher? C類火災滅火器比A類滅火器更適用于以下哪一種情況？（）

A .When the fire involves paper products當火災和紙制品有關時
B .When the fire is caused by flammable products當火災由易燃物造成
C .When the fire involves electrical equipment當火災和電器設備有關時
D .When the fire is in an enclosed area當火災發(fā)生在一個封閉空間內

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單項選擇題

The most prevalent cause of computer center fires is which of the following計算機中心火災主要的原因是以下哪一項？（）

A.AC equipment 交流電源設備
B.Natural causes 自然原因
C.Electrical distribution systems 配電系統(tǒng)
D.Heating systems 供熱系統(tǒng)

單項選擇題

Where parties do not have a shared secret and large quantities of sensitive information must be passed, the most efficient means of transferring information is to use Hybrid Encryption Methods. What does this mean?雙方?jīng)]有共享的密鑰以及大量的敏感信息需要傳輸，最有效的用于信息傳輸?shù)牡姆绞绞鞘褂没旌蟼鬏斝畔⒓用芩惴?。這是什么意思？（）

A.Use of software encryption assisted by a hardware encryption accelerator.使用由硬件加密加速器協(xié)助的軟件加密
B.Use of the recipient’s public key for encryption and decryption based on the recipient’s private key.使用接受方的公鑰進行加密以及使用接受者的私鑰既你想那個解密
C.Use of public key encryption to secure a secret key，and message encryption using the secret key.使用公鑰加密來加密秘密會話密鑰，并且使用秘密會話密鑰來加密信息
D.Use of elliptic curve encryption.使用橢圓曲線加密

Under what conditions would the use of a Class C fire extinguisher be preferable to a Class A extinguisher? C類火災滅火器比A類滅火器更適用于以下哪一種情況？（）

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The most prevalent cause of computer center fires is which of the following計算機中心火災主要的原因是以下哪一項？（）

Under what conditions would the use of a Class C fire extinguisher be preferable to a Class A extinguisher? C類火災滅火器比A類滅火器更適用于以下哪一種情況？（）

The most prevalent cause of computer center fires is which of the following計算機中心火災主要的原因是以下哪一項？（）