The radiation amount of a mobile phone for two half-hour periods per day is equal to ___ to an X-ra

题目简介

The radiation amount of a mobile phone for two half-hour periods per day is equal to ___ to an X-ra

题目详情

The radiation amount of a mobile phone for two half-hour periods per day is equal to ___ to an X-ray for ten seconds.
A.exposeB.exposingC.exposedD.being exposed
题型:单选题难度:偏易来源:不详

答案

D

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