用于游泳池水微生物指标的采样容器需提前加入10%Na2S2O3溶液的量为

A.125ml的采样瓶加入0.02ml

B.125ml的采样瓶加入0.5ml

C.125ml的采样瓶加入0.1ml

D.125ml的采样瓶加入0.2ml

E.125ml的采样瓶加入0.4ml