沸点升高,说明在溶剂中加入非挥发性溶质后,该溶剂的化学势比纯剂的化学势() ["A、升高","C、相等","B、降低","D、不确定"]
如果C类子网的掩码为255.255.255.224,则包含的子网位数、子网数目、每个子网中主机数目正确的是() ["A、2,2,62","B、3,6,30","C、4,14,14","D、5,30,6"]
无级半自主动悬架需要外加动力源,消耗的能量多。()
重油主要是()化合物。 ["A、碳氢","B、碳水","C、氢水"]
两只各装有1kg水的烧杯,一只溶有0.01mol蔗糖,另一只溶有0.01molNaCl,按同样速度降温冷却,则:() ["溶有蔗糖的杯子先结冰","两杯同时结冰","溶有NaCl的杯子先结冰","视外压而定"]
硅质耐火材料是()性耐火材料。