一定温度下,向盛有100g蔗糖溶液的烧杯中再加入5克蔗糖,充分搅拌后一定不变的是[ ]
A.溶质的质量
B.溶液的质量
C.溶质的质量分数
D.蔗糖的溶解度
答案:D
—________ that middle school ________ Beijing Normal University?
—As far as I know, it is.[ ]
A. Does; belong to
B. Is; belonged to
C. Does; attach to
D. Is; attached to
风流压力传感器运用()原理检测风流压力。