接触冲刷
参考答案：
渗流沿两种不同土壤的接触面流动时，把其中细颗粒带走的现象称为接触冲刷。
After her son died in a car accident, the old lady would sit at the window, ______ out and _______ in thought.
A．looked; lost
B．looking; losing
C．looked; losing
D．looking; lost
病人应首先查
A．血常规
B．腹部X线
C．腹部B超或CT
D．FTC
E．ERCP
