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
