分母是20的最简真分数有( )。
,,,,,,,
道路混凝土板的损坏,一般由疲劳引起的,控制混凝土破坏强度的指标,主要是()。
A.抗压强度
B.弯拉强度
C.抗剪强度
D.抗扭强度
— Do you often eat vegetables and fruit? I think it is helpful.
— Yes, I _____ you. It is good for our health. [ ]
A. look forward to
B. am satified with
C. agree with