不属于湿弱地基加固的措施是（）。
A．挤密
B．排水固结
C．碾压密实
D．浸水墙
参考答案：D
摩擦系数f越大，在压下率相同的条件下，其前滑越小。
These kids are quick at learning. We had better have them __ in a new way.
A．having been trained
B．training
C．being trained
D．trained
