一般情况下，CT图像上正常人膀胱壁的厚度为（）
A.<1mm
B.<2mm
C.<3mm
D.<4mm
E.>5mm
参考答案：C
某三级基坑深7m，由淤泥质土组成，淤泥质土厚15m，承载力［σ]=100kPa，基坑应选用（）进行支护。（）
A.悬臂式排桩
B.重力式水泥土墙
C.土钉墙
D.放坡
Two ways in which economic activity may be coordinated include:（）
A. market coordination and structural coordination.
B. firm coordination and structural coordination.
C. market coordination and firm coordination.
