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问题
单项选择题
* * 镜的放大倍数最大为:
A.400倍
B.200倍
C.40倍
D.20倍
E.10倍
答案
参考答案:
C
判断题
真皮与皮下组织间无明显界限。()
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选择题
With more factories and traffic, the air of the city is much dirtier than _____ of the suburbs.
A. it
B. that
C. one
D. those
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