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【多选题】
（）是元音和辅音的主要区别点。
A.
呼出气流是否受阻。
B.
声带振动与否。
C.
呼出气流是否强弱。
D.
书面上是否有音标记录。
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, t...
A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range