现场安全生产十二字方针的内容?
破伤风特异性治疗可应用(). ["抗生索","抗毒素","类毒素","细菌素","破伤风菌苗"]
轴承工作表面包括() ["外圈、外表面、内圈、内表面","外圈、内圈、滚子和保持架的表面","滚动体、滚道的表面","外表面、内表面"]
紫外线杀菌的原理是(). ["破坏细菌细胞壁肽聚糖结构","使苗体蛋白变形凝固","破坏DNA结构","影响细胞膜的通透性","与细菌核蛋白结合"]
润滑油润滑的滚动轴承的密封装置最好用哪一种?() ["毡圈式","皮碗式","油沟间隙式","迷宫式"]
天车起生机构由哪些机构组成?