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问题 选择题

如果在载玻片上写有9＞6的字样，用低倍显微镜观察时，视野内所见的是（　　）

A．6＞9

B．9＞6

C．6＜9

D．9＜6

答案

显微镜看到的物像不但上下颠倒，左右也颠倒．做此类题有个小诀窍，就是把这个在显微镜下看到的字母写到一张小纸上，然后把这张纸旋转180度再看就是左右上下颠倒的图象了．

故选：D．

改错题

文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。

删除：把多余的词用斜线（\）划掉。

增加：在缺词处加一个漏字符号（∧）,并在其下面写出该加的词。

修改：在错的词下划一横线,在该词下面写出修改后的词。

注意：1、每处错误及修改均仅限一词。

2、只允许修改10处,多者（从11处起）不计分。

I saw a accident happen on my way to home this afternoon. A girl was crossing the street on a zebra crossing while a young man drove a motorbike towards her. The young man saw the girl and tried to stop, and he drove too fast to stop. He hit the girl and fell off his motorbike. The girl was bad hurt and couldn’t move. The young man didn’t know how to do. I ran to a phone box nearby and dialed 110. Soon the police reached. They sent her hospital at once. One of the policeman talked to the young man and wrote something down while he was talking. I thought it is very dangerous to drive very fast.
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单项选择题

基础中纵向受力钢筋的保护层厚度不应小于（）。

A.25mm

B.30mm

C.40mm

D.50mm
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