题目：
月球离地球约380 000千米，这个数用科学记数法表示应记作（ ）
A．3.8×104千米
B．3.8×105千米
C．0.38×106千米
D．38×104千米
答案：
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参考答案：C
月球离地球约380 000千米，这个数用科学记数法表示应记作（ ） A．3.8×
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