t℃时，将100g某物质A的溶液蒸发掉10g水，恢复至t℃，析出2.5g晶

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t℃时，将100g某物质A的溶液蒸发掉10g水，恢复至t℃，析出2.5g晶体，再蒸发掉10g水，恢复至t℃，析出7.5g晶体．下列说法中不正确的是（　　）

A．t℃时原溶液是不饱和溶液

B．若A是CuSO₄，则7.5g晶体中含水2.7g

C．t℃时，A的溶解度为75g

D．原溶液中A的质量分数为40%

答案

ABCD

句型转换

句型转换。

1. He studies at No.1 Middle School. (改为否定句)

He _________ _________ at No.1 Middle School.

2. He plays basketball very well. (改为同义句)

He is _________ _________ playing basketball.

3. My brother walks to the school every day.(改为同义句)

My brother goes to school __________ _________ every day.

4. She never goes roller skating. (对划线部分提问)

__________ _________ does she go roller skating?

5.There is some bread on the table.(改为一般疑问句)

_________ there _________ bread on the table?

填空题

在典型的市场经济中，总供给和总需求失衡的直接后果是（）。