以下污染源中属于移动源的是( )
A. 工程机械
B. 农用机械
C. 船舶
D. 飞机
Web标准不包括下面哪一个选项
A. 结构
B. 行为
C. 程序
D. 表现
网页文件的后缀名是（）
A. .js
B. .txt
C. .css
D. .html
下列标签不属于head内的标签是（）
A.
B.
C.
D.
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