简述链条磨损的原因?
参考答案:
链条过于张紧,两链轮不在同一平面,链条干燥缺油,都会造成链条磨损。
You are really very kind.I'll never forget the ______ you have done to me. [ ]
A. favour
B. deed
C. help
D. kind
为了在程序运行时,使被遮的窗口又重现,用窗体的Picture属性设置的背景图像会自动重画,设置值为True的属性是
A.Scale
B.AutoRedraw
C.Resize
D.AutoSize