题干
-- Jim has been working hard all these days.
-- _____________ he passed the exam with ease.
A：No doubt
B：No wonder
C：No way
D：No means
答案(点此获取答案解析）
B
-- Jim has been working hard all these days.
-- _____________ he passed the exam with ease.
A：No doubt
B：No wonder
C：No way
D：No means
0g/cm3，其中NO3-的质量分数为3．1％，2 L该溶液中Ca2+的物质的量约等于 （ ）