搜题请搜索小程序“爱下问搜题”
问题
多项选择题
下列各项中属于主动免疫制剂的是()
A.菌苗
B.疫苗
C.抗毒素
D.类毒素
E.丙种球蛋白
答案
参考答案：
A, B, D
选择题
|-7|的相反数是（ ）
A．7
B．-7
C．
1
7
D．-
1
7
查看答案
选择题
The girls _____ a game called Bomb happily when the teacher suddenly entered the classroom.
A. played
B. were playing
C. are playing
D. had played
查看答案
