会议筹备方案是会议准备工作的基础,应做到()。
A.集思广益
B.事先协商
C.精心策划
D.注重实效
参考答案:A, C
Is it cool? [ ]
A. Yes, it's warm.
B. It is hot today.
C. No, it isn't.
血清抑菌力/杀菌力比例高于多少时,为严重感染()
A.1:4
B.1:8
C.1:16
D.1:32
E.1:64