下列叙述中与局部阻力大小成正比的是()
A.管径
B.管长
C.沿程阻力系数
D.流速
参考答案:A
Just as the clothes a person wears , the food he eats and the friends with whom he spends his time, his house his personality.
A.resembles
B.strengthens
C.reflects
D.shapes
如图是A、B两种物质的溶解度曲线,下列叙述中正确的是
A.T1℃时,100gA的饱和溶液中含有20gA
B.T2℃时,A和B的溶解度相等
C.A的溶解度大于B的溶解度
D.当A中含有少量的B时,可用蒸发结晶的方法提纯A