1936年，美国通过了《土壤保护和国内配额法》。这个立法把作物分成“消耗地力的”和“

对急性铅中毒患者给予（）
对慢性中重度铅中毒患者给予（）
对慢性重症铅性脑病患者给予（）

A.驱铅治疗

B.卫生教育

C.糖皮质激素

D.补充蛋白质

E.硫酸钠（洗胃、导泻）

一个数由6个十，4个百分之一组成，这个数是______．

句型转换(由直接引语变间接引语/由间接引语变直接引语)。

1.The teacher asked me，“Do you have difficulty working it out?”______________________________________________________________________________________________________________________________________________________________

2. His father said to him，“I will have a picnic tomorrow. ”______________________________________________________________________________________________________________________________________________________________

3. Tom asked Kate，“How did you get the book?”______________________________________________________________________________________________________________________________________________________________

4. Mike told Kate not to play with water.______________________________________________________________________________________________________________________________________________________________

5. Lucy said to Jim she had finished the homework two hours before.______________________________________________________________________________________________________________________________________________________________

根据沉降公式(Stock’s方程)计算所得的直径称为

A．定方向径
B．等价径
C．体积等价径
D．有效径
E．筛分径

什么条件下可以对购进的产品采取紧急放行。