已知1％硫酸阿托品和1％氯化钠的冰点降低数为0.073℃和0.578℃，

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问题单项选择题

已知1％硫酸阿托品和1％氯化钠的冰点降低数为0.073℃和0.578℃，现欲配置5％的硫酸阿托品注射剂5000ml，请问需要加入多少克氯化钠才能达到等渗

A．0.35

B．0.86

C．1.2

D．12.4

E．13.4

答案

参考答案：E

问答题

某用电器R₁上标有“10Ω 3A”，另一用电器R₂上标有“50Ω 1.5A”，串联后接到电源上，为了使其中一个用电器正常工作，电源电压应不超过何值？

填空题

根据旬意用括号内所给词的适当形式填空。

1．Thank you for ________ (organize)the class trip．

2．This is the ________ (child)playhouse．

3．His brother ________ (study)English very hard．

4．- Whose is this sweater? - It's ________ (he)．

5．- What do you use to brush your ________ (tooth)? - toothbrush．

6．- Who ________ (cook)the meals in our home?

- My mother does．She is a very good cook．

7．- When is ________ (teacher)Day? - On September 10th．

8．We are really ________ (excite)at the exciting news．

9．He is ________ (dress)up as a ghost．

10．Do you have ________ (some)books about Halloween?