事实构成
钢丝绳在运行中遭受猛烈拉力的一段的长度伸长()%以上,必须将受力段剁掉或更换全绳。 ["0.1%","0.3%","0.5%","0.7%"]
在级进模中,常用侧刃做粗定位,导正销做精定位;为保证条料在被导正时处于自由状态,设计时应注意() ["侧刃长度应等于步距","侧刃长度应略大于步距","侧刃长度应略小于步距","侧刃长度应略大与或等于步距"]
较大突发事件一般用()表示。 ["橙色","蓝色","黄色","红色"]
缓圆点的英文缩写符是()。 ["SC","HY","ST","IP"]
试概括早期社会调查的贡献与局限。