It is better to teach a man to fish than ____ him fish.
A.giving
B.to give
C.gives
D.gave
答案:B
某饱和软土,厚20m,采用袋装砂井排水固结,砂井直径dw=0.07m,间距1.4m,三角形布置,砂井穿透软土层,往下为不透水层,固结系数ch=cv=1.8×10-3cm2/s,预压荷载p=100kPa,分两级加载,第一级60kPa,10天内加上,预压20天,而后10天内加至100kPa,计算120天时的固结度接近()
A.93%
B.80%
C.50%
D.98%
蒸发器组的蒸发效率、蒸水汽耗(汽/水)分别与哪些因素有关?