A.烧碱溶液
B.盐酸
C.食盐溶液
D.氯化钡溶液
B
从沉淀角度考虑,都是白色沉淀,没有区分度;若从产生气体的角度考虑,现象不一样,分别产生H2S、SO2、CO2气体。
Many pregnant women have bought this kind of clothes to ________ radiation.
A.block
B.protect
C.distinguish
D.guarantee