特发性血小板减少性紫癜血小板相关抗体主要抗体成分为()
A.IgA
B.IgE
C.IgM
D.IgG
E.IgM、IgA
参考答案:D
Niagara Falls is a great tourist _______,drawing millions of visitors every day.
A.attention
B.attraction
C.appointment
D.arrangement
通常()人或以下称为旅游散客。
A.10
B.9
C.8
D.7