材料所受扭矩的单位是() ["A.牛顿","B.帕","C.牛顿•米","D.不一定"]
通常对温度要做出规定,如外圆磨床砂轮架一般要求温升不超过50℃。()
材料所受剪力的单位是() ["A.无量纲","B.帕","C.牛顿","D.不一定"]
依据现行《建筑设计防火规范》的规定,二类隧道应在隧道()设置ABC类灭火器,每个设置点不应少于() ["两侧,4","一侧,4","两侧,2","一侧,2"]
当移动式启闭机需要运行时,应先打开()、锚定装置和铁鞋装置。 ["A.电源","B.夹轨器","C.操作手柄","D.操作室"]
陆机撰写《文赋》的目的是()