單項(xiàng)選擇題br標(biāo)簽在XHTML中語(yǔ)義為下面哪一項(xiàng)? ()
A.換行
B.強(qiáng)調(diào)
C.段落
D.標(biāo)題
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1.單項(xiàng)選擇題如何在CSS文件中插入注釋?zhuān)浚ǎ?/a>
A.//this is a comment
B.//this is a comment//
C./*this is a comment*/
D.’this is a comment
2.單項(xiàng)選擇題表單提交時(shí)會(huì)觸發(fā)什么Dom事件()
A.submit
B.onsubmit
C.onupload
D.onresize