What did he _____ at the meeting? [ ]
A. say
B. speak
C. talk
D. tell
答案:A
当菌斑染色阳性百分率为多少时,即属于菌斑被基本控制
A.10%以下
B.15%以下
C.20%以下
D.25%以下
E.30%以下