当稀介质旋浮液的浓度大于()%时,可直接进入磁选机净化回收。 ["15","20","25","30"]
用极限平衡理论计算岩基承载力时,条形荷载作用下均质岩基的破坏面形式一般假定为:() ["单一平面","双直交平面","圆弧曲面","螺旋曲面"]
水分占正常关节软骨总重量的比例是()。 ["5%~8%","15%~18%","18%~20%","65%~80%","90%"]
进入磁力脱水槽固体的质量浓度低于10%时,磁力脱水槽可脱除()的水分。 ["40~50%","35~40%","35~45%","35~50%"]
()是指本站始发至外站,却因故未能按原定航班与旅客同机到达而尚待查找的行李。 ["A、到达少收行李","B、出发少收行李","C、自理行李","D、手提行李"]
消费者价格指数有何优点和缺陷?