锥比
参考答案：底流口直径与溢流口直径比叫做锥比。
We know koalas are very lovely, and they live _____.[ ]
A. in Australian
B. in Australia
C. from Australia
D. from Australian
测定沥青路面渗水系数，每一个检测路段应选（）个测点
A.5
B.10
C.3
D.6
