三相异步电动机的定子铁芯是电动机的主要磁路部分，通常由冲击成的（）厚的硅钢片叠成。B

玻片上写有一“p”字母，在显微镜视野中看到的物像是(    )

A．q

B．d

C．b

D．p

请将下列句子改为否定句，每空一词（含缩写）。

1. Li Ming receives an e-mail.

    Li Ming                         an e-mail.

2. My English will become very good.

    My English                          very good.

3. He can come to our school.

    He                          to our school.

4. They had a good time in Qingdao.

    They                         a good time in Qingdao.

5. I wanted to go to the big store to buy something.

    I                          to go to the big store to buy anything.

6. Sit here, please. 

                              here, please.

7. My mother is washing the clothes.

    My mother                           the clothes.

8. There are some desks in the classroom. 

     There                          desks in the classroom.

下列哪种营养素是谷胱甘肽过氧化物酶的组成成分（）

A.钙

B.硒

C.碘

D.铁

E.铜

下列关于急性肾小管坏死病因和病理的叙述，错误的是（）

A.各种原因导致有效循环血容量减少，肾灌注不足，可导致急性肾小管坏死

B.肾缺血可导致肾前性急性肾衰竭，不会引起急性肾小管坏死

C.血红蛋白可作为一种内源性毒素引起急性肾小管坏死

D.常见的外源性毒素有抗菌药物、造影剂

E.肾毒素引起者，病变主要在近曲小管；肾缺血所致者，小管髓袢升段和远端小管的病变最为明显

冷却塔补充水量，应考虑蒸发损失水量、风吹损失水量和排污损失水量，一般按循环水量的()计算。

A．3％～5％

B．2％～5％

C．4％～6％

D．2％～6％