We're going to mountains tomorrow. [ ]
A. climb
B. climbed
C. climbing
答案:A
注射疫苗属()。
A、自动免疫
B、被动免疫
C、细胞免疫
下列指数中常用来描述牙周状况的是()
A.DMFT
B.dmfs
C.DMFS
D.Dean指敷
E.CPI