应急预防乙型肝炎有效的免疫制剂是
A.人血清蛋白
B.HBIgG
C.胎盘球蛋白
D.以上都是
E.丙种球蛋白
参考答案:B
The new education system is said to be _______ to the successful development of the country.
A.apparent
B.central
C.allergic
D.generous
纬圈环流