That’s a good idea. The ____ need to know what they are going to buy first.
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After the presentations we should allow time for a ____, in case the clients have any questions.
I think that would really ____ the boss.
OK, don’t forget to make some ____copies to give to the new clients and anyone else who forgets to bring theirs.
声音的频率范围是 ()。
A. 大于20赫兹小于20000赫兹
B. 小于200赫兹或大于20000赫兹
C. 小于200赫兹或大于2000赫兹
D. 大于20赫兹小于2000赫兹
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