My life ____ a lot in the last few years. [ ]
A. change
B. changed
C. has changed
答案:C
HBV对外界的抵抗力很强,以下正确的是()
A.耐低温
B.煮沸10分钟可被灭活
C.不能耐受紫外线
D.37℃可存活7天
E.对0.2%新洁尔灭不敏感
环穿小车基站发射和接收是()
A.一样
B.不一样
C.不要求