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【单选题】
下面关于“编辑样式表”对话框的设置说法错误的是( )。
A.
可以设置连接独立的外部样式表文件
B.
可以新建一个HTML元素样式
C.
可以同时编辑存在样式表中的两个元素样式
D.
可以删除当前样式表中的样式元素
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【简答题】试证明：▽ 2 (μν)=μ▽ 2 ν+ν▽ 2 μ+2▽μ·▽ν
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