防己地黄汤的主药是（） A.甘李根白皮 B.芍药 C.两者均可 D.两者均非

句型转换。

1. She lived in New Zealand. (对划线部分提问)

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2. Anne and her friends are playing in the snow. (对划线部分提问)

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3. There are twelve month in a year. (对划线部分提问)

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4. It's cool in autumn. (同义句)

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5. He bought a new house in 2000. (否定句)

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竞争和（）成为古典人文区学分析社区的两个重要概念。

根据给定的器材，设计实验测定未知电阻R_x 的电阻值．  

器材：电压未知的稳压电源一个；已知电阻值的电阻R₀一个；符合要求的电流表一块；单刀单掷开关两个；待测电阻R_x 以及导线若干，   要求：实验过程中不得拆改电路．

(1) 请在方框内画出电路图．

(2) 简述实验步骤；

①按照电路图连接电路，并检查无错误、无故障；

② ________________________________

③_________________________________

(3)测量计算式R_x=__________________．

Have you got the message I left with your father yesterday_______ you’ll have an important meeting tomorrow afternoon.                           

A．in which

B．with whom

C．that

D．which

剥脱性皮炎型药疹首次发病的潜伏期约为()

A．3天

B．7天

C．15天

D．20天