题目内容
(请给出正确答案)
[单选题]
The content of a letter is a().
A.channel
B. message
C. feedback
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A.channel
B. message
C. feedback
A.append(content)
B.appendTo(content)
C.insertAfter(content)
D.after(content)
A.#content{width:200px;height:100px;float:left;}
B.#content{width:100px;height:200px;clear:left;}
C.#content{width:200px;height:100px;clear:left;}
D.#content{width:100px;height:200px;float:left;}
A.content
B.notional
C.empty
D.new
A.Data content and backup
B.Integrity and security of data
C.Authentication of user access
D.Classification of data elements