渗流参数有渗流(),渗流(),渗流(),渗流(),单位土体上的渗流()。
参考答案:压力水头;坡降;流速;流量;动水压力
After _______ seemed half an hour, the teacher gave us the correct answer.
A.what
B.that
C.which
D.it
湄公河上游在我国境内的河段叫______。