【简答题】§3.有侧线采出的平衡级的固定设计变量数 为()。
【单选题】The old couple lived in abject poverty.
【单选题】The old lived ___there are many trees
【单选题】The old lived _____ there are many tress.
【单选题】The old couple lived in abject poverty.
【单选题】The old couple lived in abject poverty.
【多选题】左图中使用了一种特殊的定位元件(菱形销也称削边销)对工件定位,下列说法 不 正确的是
D.
菱形销也称削边销可用圆柱销加工得到,它的长边起定位作用,短边与被定位的孔不接触