试题详情

GB50325-2020规定,当民用建筑工程场地土壤氡浓度不大于()或土壤表面氢析出率不大于()时,可不采取防氡工程措施。

A2000 Bq/m3,0.05 Bq/(m2.S)

B20000Bq/m3,0.5 Bq/(m2.s)

C20000Bq/m3,0.05Bq/(m2.s)