压差对钻速的影响，在低渗岩层比高渗岩层影响（）。A、小 B、相近 C、大 D、无法判

下列抗结核药物可通过血-脑脊液屏障的是（）

A.利福平

B.链霉素

C.异烟肼

D.利福布汀

E.乙胺丁醇

用所给单词的适当形式填空。

1. Look, the children are doing morning _____ (exercise).

2. My brother and I like _____ (drink) coffee.

3. The bird can _____ (sing) the "ABC" song. It's very clever.

4. His mother often _____ (help) him to do his homework.

5. There are many _____ (different) between you and your twin brother.

6. I go to the movies _____  (first) a month.

7. He's too young. He can _____ (hard) ride a bike.

8. Our English teacher likes to wear _____ (color) clothes, because she wants to be young .

9. A good _____ (eat) habit is good for your health.

10. In winter, my father often goes _____  (skate) .

天轮与天轮平台各构件间应（）

A.不小于50mm

B.不小于60mm

C.不大于50cm

D.不大于60cm

肾癌直径小于多少时，可以行保留肾组织的局部切除术

A．1cm

B．2cm

C．3cm

D．4cm

E．5cm

为了避免水泵发热，在关闭闸阀时运转不能超过3min