这个标志是何含义？（） A．环行交叉路口预告 B．十字交叉路口预告 C．丁字交叉路口

按要求改写句子。

1. Jenny goes to school on Monday. (改为否定句)

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2. She eats breakfast at seven. (就划线部分提问)

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3. Jenny is combing her hair. (改为一般疑问句)

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4. I wake up at 6: 20 in the morning. (改为否定句)

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TDM是指

A．临床药动学监测

B．临床药效学监测

C．体内药物代谢分析

D．治疗药物监测

E．治疗药物评价

在常压条件下加热蒸馏或回流时，液体量不能超过烧瓶容量的（）。

A、1/4

B、2/3

C、1/2

D、1

The calculations, had they been done by hand,        all practical value by the time they were finished. [ ]

A. had lost      

B. would lose  

C. should have lost  

D. would have lost

正常的锯切温度是（）。

A.550～650℃

B.650～750℃

C.≥750℃