一般，石灰、石膏、水泥三者的胶结强度的关系是（） A.石灰>石膏>水泥 B.石灰 C

阅读理解，判断正"T"误"F"。

    Here's a message from Mary. She went to hospital yesterday. She had a cold. But she is better now.

This morning she went to Lucy's office. She met Lucy and Tom there. She is very busy now. She will be

back at seven o'clock. She will have dinner with us. I will make Chinese food for her. She likes Chinese

food very much.

( ) 1. Mary went to school yesterday.

( ) 2. Mary had a cold.

( ) 3. Mary went to Tom's office.

( ) 4. Mary likes English food very much.

眼球壁包括（）

A.角膜-巩膜-虹膜-视网膜

B.结膜-角膜-巩膜-视网膜

C.角膜-巩膜-葡萄膜-视网膜

D.角膜-巩膜-睫状体-视网膜

E.角膜-巩膜-脉络膜-视网膜

The book was written in  1946,         the education system has witnessed great changes.        [ ]

A. when                        

B. during which        

C. since then                    

D. since when

沸腾床的布风系统是由风室、布风板和风帽三部分组成。

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