用硫酸分解磷矿可以生成不同水合结晶的硫酸钙，即（）。A、二水

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问题单项选择题

用硫酸分解磷矿可以生成不同水合结晶的硫酸钙，即（）。

A、二水物（CaSO₄·2H₂O）、一水物（CaSO₄·H₂O）、无水物（CaSO₄）

B、二水物（CaSO₄·2H₂O）、半水物（CaSO₄·1/2H₂O）、无水物（CaSO₄）

C、二水物（CaSO₄·2H₂O）、一水物（CaSO₄·H₂O）、半水物（CaSO₄·1/2H₂O）

D、B和C

答案

参考答案：B

填空题

用所给词的正确形式填空

1.His grandpa _________ (die) ten years ago.

2.Look! Some students __________ (sing) to the music.

3.She will come back if she _________ (be) free.

4.They were pleased to see the _________ (move) film.

5.To my _________ (surprise), I can meet you here.

6.The _________ (two) lesson is the most difficult one.

7.Jim did the work _________ (well) of all the students.

8.Spaceships _________ (with) people have reached other parts of the universe.

9.Amy practices __________ (speak) Chinese for an hour every day.

10.Look! How __________ (beautiful) these pictures are!

名词解释

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