芒硝主含的成分是()
A.Na2SO4
B.Na2SO4·7H2O
C.HgS
D.Na2SO410H2O
E.Hg2S
参考答案:D
输血可传播以下哪种疾病()
A.结核
B.伤寒
C.疟疾
D.钩虫病
E.甲型肝炎
VBA中打开"student"表的语句是( )。
A.DocmOpenForm "student"
B.DocmOpenQuery "student"
C.DocmOpenTable "student"
D.DocmOpenreport "student"