利用敷设在气流通道内的多孔吸声材料来吸收声能，降低沿通道传播的噪声，主要用于中、高频消声器为（）
A. 阻性消声器
B. 抗性消声器
C. 阻抗复合消声器
D. 干涉型消声器
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站点文件的扩展名是：
A. .html
B. .asp
C. .css
D. .dwt
新建网页的快捷键是（）
A. ctrl+S
B. ctrl+N
C. ctrl+空格
D. ctrl+shift+空格
在HTML中，浏览器左上角显示的标题是通过（）标签设置的。
A.
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