母体免疫球蛋白能通过胎盘转移给胎儿的是
A．IgM
B．IgA
C．IgG
D．IgD
E．IgE
参考答案：C
— _________?
— Yes, I want some apples.[ ]
A. What are you doing
B. Where are you doing
C. What are you want to buy
D. May I help you
某工程一层水泥混凝土地面面积为500m2，应留置混凝土试块的最少组数为（）。
A.1
B.3
C.4
D.5
