A.2 X 10-3 m B.2 X 10-4m C. 4 X 10-4 m

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问题 A.2 X 10-3 mB.2 X 10-4mC. 4 X 10-4 mD. 4 X 10-3 m

选项 A.2 X 10-3 m
B.2 X 10-4m
C. 4 X 10-4 m
D. 4 X 10-3 m

答案 D

解析
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