血浆中含有抗A和抗B凝集素的血型是
A.A型B.B型C.O型D.AB型E.Rh阳性
参考答案:C
—It’s already nine o’clock.Would now be a(n) moment to show the sides?
—OK,go ahead please.
A.necessary
B.gradual
C.suitable
D.important
简述问卷的基本结构。