A.a点溶液中只有一种溶质
B.b点溶液中滴加紫色石蕊溶液,溶液变蓝
C.d点溶液中有较多的Ba2+、OH-、SO42-、H+
D.c点烧杯内液体的pH____(选填“大于”“等于”或“小于”)7
首先测出大气压值的物理学家是( )
一Why do you get up so early in the morning,Tracy?
--I generally make it a to be up by 7 am to read English.