在渗流作用下，非黏性土土体内的细小颗粒沿着粗大颗粒间的孔隙通

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问题单项选择题

在渗流作用下，非黏性土土体内的细小颗粒沿着粗大颗粒间的孔隙通道移动或被渗流带出，致使土层中形成孔道而产生集中涌水的现象称为( )。

A．流土
B．接触冲刷
C．管涌
D．接触流土

答案

参考答案：C

听力题

第一节单词拼写（共10小题，每小题2分，满分20分）

小题1:The factory （遭受）severe damage in the fire last year.

小题2:Do (确切地)as the teacher says.

小题3:I’m afraid I (不同意)with you.

小题4:The pianist listened to our (请求，要求) that he play in public again

小题5:Now she is planning our (时间表)for the trip.

小题6:The house (爆发) into flames when I was sleeping..

小题7:We had a good. (风景) of the town from the top of the hill.

小题8:The old lady needs a few feather （枕头）to make herself comfortable.

小题9:While a person is asleep,a part of his brain is still (积极的)

小题10:He offered guidance to poor black people on their (法律的)problems.

问答题简答题

血浆凝血酶原时间参考值如何确定？有何临床意义？