问题
选择题
Everything was perfect for the picnic_____ the weather.[ ]
A. in place of
B. as well as
C. except for
D. in case of
答案
答案：C
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Everything was perfect for the picnic_____ the weather.[ ]
A. in place of
B. as well as
C. except for
D. in case of
答案：C
A 声波具有能量
B 声波定向发射器喇叭状外观可以减少声音的分散，从而增大响度
C 使用“金嗓子”时，护航官兵佩戴耳罩是在人耳处减弱噪声
D “金噪子”发出的声波是次声波