1978年以来健康教育模式已由过去单一的大众宣传逐步转变为行为危险因素干预
参考答案:对
写出下列各句的一般疑问句形式。
1. I played football yesterday.
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2. She wanted to buy a gift for you.
3. She washed clothes at home.
4. They cooked noodles together last Sunday.
5. He missed his grandmother.
两个电阻相串联接入电路,各分得的电压与其阻值的关系是()。
A.成正比
B.成反比
C.在直流电路中成正比,在交流电路中成反比
D.在直流电路中成反比,在交流电路中成正比