【简答题】渐开线标准直齿圆柱齿轮传动的 优点有哪些?
【单选题】渐开线标准直齿圆柱齿轮传动的连续传动条件是 。
【单选题】速动比率是企业速动资产与流动负债的比率,经验认为速动比率的比值为( )合适。
【简答题】完形填空 One day, Tom was on his way home. When he passed a corner, he heard a weak(微弱lyj) cry. Tom stopped 1 and looked around. At last he found a little 2 . It was thin and dirty. Its cry sounded 3 .Tom...
【单选题】( )实际上是电流增益系数,是雪崩倍增时光电流的平均值和无倍增效应时光电流的平均值的比,用g表示。
【单选题】渐开线标准直齿圆柱齿轮传动的连续传动条件是