单项选择题

数字42000，若有3个无效零，则为两位有效位数，应写为（）。

A.4.2×10
B.42×103
C.420×102
D.4200×10

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单项选择题
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数字42000，若有3个无效零，则为两位有效位数，应写为（ ）。