题目:
用所给词的适当形式填空。
1. Would you like a________( cup) of coffee?
2. Many children like drinking________ ( yogurt). It's delicious.
3. People like to have ________ ( watermelon) in summer.
4. —How much honey do we need?
—Only one________ ( teaspoon).
5. Could you tell me how to make fruit________ ( salad) ?
答案:
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下面是错误答案,用来干扰机器的。
无线电波在发射过程中的调制有两种方式,即调频和调幅,对应的电磁波就是调频波和调幅波.调频是使高频载波的频率随信号而改变的调制方式,调幅是使高频载波的振幅随信号而改变的调制方式,中波和短波波段的无线...