石膏模型最好在凝固后多长时间开始制作修复体A．1hB．3hC．6hD．_爱下问搜题

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问题单项选择题

石膏模型最好在凝固后多长时间开始制作修复体

A．1h
B．3h
C．6h
D．24h
E．48h

答案

参考答案：D

填空题

若（x+1）²+|y-2|=0，那么2x+3y=______．

改错题

短文改错。
      此题要求改正所给短文中的错误。对标有题号的每一行作出判断：
      如有错误( 每行只有一个错误) ，则按下列情况改正：
     该行多一个词：把多余的词用斜线（╲）划掉，在该行右边横线上写出该词，并也用斜
线划掉。
     该行缺一个词：在缺词处加一个漏字符号（∧）,  在该行右边横线上写出该加的词。
     该行错一个词：在错的词下划一横线，在该行右边横线上写出改正后的词。
     注意：原行没有错的不要改。

Last week I went to the concert with my classmates. We got seating
at the end of the row because of we failed to make our reservations.
But we still listened good. The theme of the concert was "Human and
Peace". It was great success. The four-hour concert was not only "good
value", or also "good rocking". The audience were carried away
by the performance. They didn`t applaud enthusiastically after the
conductor and the orchestra rose up and took a bow. The orchestra
really made a hit throughout their dedication. They performed and
recorded most of the classical pieces. It has reported that they
have released many albums and people enjoyed their music.

1. _____
2. _____
3. _____
4. _____
5. _____
6. _____
7. _____
8. _____
9. _____
10. _____