He________to put any sugar into the soup. [ ]
A. needn't
B. needs
C. doesn't need
D. need
C
某基坑为潜水完整井降水,含水层厚度20m,渗透系数K=4m/d,平均单井出水量q=500m3/d,井群影响半径R0=130m,计算基坑中心点水位降深接近()
A.9.4m
B.9.0m
C.10m
D.9.6m
简述我国土地利用现状分类体系?