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【简答题】
函数 中x的取值范围为（ ）。
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【简答题】Part A Suppose you have a foreign friend, Frank Harrison, who invited you to his house for a dinner party yesterday. Write a letter of thanks to Mr. Frank Harrison, telling him about: 1) your thanks f...
【单选题】You have invited a business colleague to lunch. Who pays for the meal?
A.
You because you invited your colleague to lunch.
B.
Your business colleague because she accepted the invitation.
C.
Whichever one of you the waiter places the bill in front of pays.
D.
You both pay half.
【简答题】人类的话音信号波形的频率范围一般是 ( )。
【简答题】下列具有利尿作用的药物是（ ）
【简答题】可将㨰法分为 、 、 、 等术式。
【单选题】Do you know how many people ______ up to now?
A.
have invited
B.
have been invited
C.
had invited
D.
had been invited
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