孔的尺寸总是小于轴的尺寸，称为（）配合。
参考答案：过盈
牙周膜所具有的神经末梢种类是（）
A.游离末梢
B.Ruffini末梢
C.环状末梢
D.以上均是
E.以上均不是
They have saved 90 people, _____ last year. [ ]
A. twice of many
B. twice as many as
C. twice more
D. twice as much as
