教师的教育机智在教学中主要体现在()
A.善于因势利导;
B.善于随机应变;
C.善于对症下药;
D.善于掌握分寸
参考答案:A, B, C, D
The league secretary and monitor()asked to make a speech at the meeting.
A.has
B.was
C.are
D.were
在进行临床试验没计时,允许犯第二类错误的概率最大值是取
A.β=0.01
B.β=0.05
C.β=0.10
D.β=0.20
E.β=0.25