物体的干摩擦是按()分类的。 ["表面润滑状态","相对运动位移","磨擦副运动状态","磨擦介质不同"]
目前Internet的缺省服务模型是()。 ["Best-Effort service","Integrated service","Differentiated service","Best service"]
抢筑透水土撑前,应在滑坡范围内先()。 ["铺设土工膜","铺设防水布","挖除滑坡土体","抢筑导渗沟"]
物体的流体磨擦是由其()引起的磨擦。 ["流动方向","温度变化","粘性阻力","密度变化"]
抢护背水坡滑坡险情时,可在滑坡范围内间隔抢筑()以对其加固阻滑。 ["黏土铺盖","黏土后戗","透水土撑","子堤"]
SP-2102型可燃气体检测仪错误代码为E01时,处置方法为()。