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问题
单项选择题
若显微镜的油浸镜上的油已干,可用拭镜纸沾何物擦净,然后再用干净擦拭镜纸擦干净()
A.清水
B.石蜡
C.无水乙醇
D.二甲苯
E.以上都不是
答案
参考答案:
C
选择题
My brother _______ in a police station, but he _______ now.
A. work, is working
B. works, not works
C. is working, works
D. works, isn't working
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名词解释
幅度
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