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问题 选择题

下列命题中，真命题的是（　　）

A．平分弦的直径垂直于弦

B．圆的半径垂直于圆的切线

C．到圆心的距离大于半径的点在圆外

D．等弦所对的圆心角相等

答案

A、应强调这条弦不是直径，故错误；

B、应为圆的半径垂直于过这条半径的外端点的圆的切线，故错误；

C、根据点和圆的位置关系，故正确；

D、应强调在同圆或等圆中，故错误．

故选C．

改错题

请同学们严格按照题目给出的格式改错，否则不得分。如无错误；在该行右边横线上划

一个（√）；若该行多一个词：把多余的词用斜线（\）划掉，在该行右横线上写出该词，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；若该行错一个词；在错的词下划一横线，在该行右边横线上写出改正后的词。

The winter holiday is coming, which makes me very exciting．小题1:             

I have been looking forward to relax myself and I'd like        小题2:             

to go fishing, climb high mountain and ride my bicycle．      小题3:             

I think I can play football or play the chess with my father      小题4:             

as well．What wonderful time 1 will have during the winter    小题5:             

holiday! But my father has differently opinions．He doesn't    小题6:             

want me to go out．He's afraid that I'll be knocked on by      小题7:             

a truck, fall into rivers, fell off a tree or fight with others．     小题8:             

What's worse, he's afraid I will get lost．1 hate being treated   小题9:             

like a bird kept in a cage．I need freedom but I wii! try to     小题10:             

persuade my father．
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单项选择题 A1/A2型题

缺铁性贫血患者，RBC直方图常表现为（）

A.波峰右移、峰底变宽

B.波峰左移、峰底变宽

C.波峰右移、峰底不变

D.波峰左移、峰底不变

E.直方图不变
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