β放射源主要用作β活度测量和β能量响应刻度时的参考源和工作源，还可用作（）。
A、放射性测厚仪ABC
暂无解析
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Inordertohelpyoutodevelopbusinessinthisline,wearepreparetoofferyouadiscountof5%.
Moreandmorecompaniesareallowingemployeestoworkathome.Doyouthinkthisisapositiveornegativedevelopment?
Thelocalgovernmentwill_____morecollegesformorestudentstoreceivehighereducation.
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