题目

显微镜的使用步骤是                                                                                                                  (        )①取镜安放  ②对光  ③放置玻片标本  ④收放  ⑤观察A.①②③⑤④                B.①③②④⑤          C.①⑤④③②                  D.①③②⑤④  答案:A解析:略 
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