坝体和坝基土体中部分颗粒被渗流水带走的现象称为（）。
A.管涌
B.流土
C.剥离
D.接触冲刷
参考答案：A
No one appreciated his work during his lifetime, but ______ it is clear that he was a great artist.
A．in the aftermath
B．by the time
C．in retrospect
D．in this eventuality
病毒性肝炎控制关键点
