如何防止刮板输送机“反货”?
参考答案:
(1)保证刮板输送机间有足够的搭接空间(相互搭接的输送机,搭接长度不小于500mm,搭接高度不小于300°)。
(2)挖货载堆积坑。
-Why didn’t you go to Mike’s birthday party yesterday?
-Well, I _______, but I forgot it.[ ]
A. should
B. would
C. should have
D. must have
渐开线直齿圆柱齿轮中标准齿轮的含义是什么?