A:110°
B:100°
C:190°
D:120°
100毫升0.3摩尔/升Na2SO4溶液和50毫升0.2摩尔/升Al2(SO4)3溶液混合后,溶液中SO42﹣离子的物质的量浓度为( )
—John didn't stop looking for a job _________ he got an offer from a German company.
—Lucky him. It's not easy for university graduates to get a good job now.
下列说法错误的是( )