一种生理盐水重250克，含盐率是10%，现在使含盐率提高到25%，应

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问题填空题

一种生理盐水重250克，含盐率是10%，现在使含盐率提高到25%，应加入______克盐．

答案

250×（1-10%）÷（1-25%）-250

=250×0.9÷0.75-250

=300-250

=50（克）

答：应加入50克盐．

故答案为：50．

填空题

用所给动词的适当形式填空。

1. The children were _____in the ________ story. (interest)

2. We were all_______ to hear the _______ news. ( excite)

3. The result of the test was rather ____. He was very ______ at it. ( disappoint)

4. I've never heard the word ______(use) in spoken English.

5. They often saw the little boy _______(punish) by his step mother.

6. The only thing I could do was _______ (do) it alone.

7. She doesn't mind______ (work) over time.

8. I'11 have the book _______( bring) over to you soon.

9. Besides ________(read) ,he is fond of ____ (dance) and ____ (skate).

10. The meeting ______ (take place) next week is very important.

单项选择题

使用水浴槽的体外冲击波碎石术（ESWL）采用连续硬膜外麻醉时，阻滞的最低平面需达到（）

A.T₂

B.T₄

C.T₆

D.T₈

E.T₁₀