泥石流沉积的最大特点是()。
A.泥、砂同时沉积,分选好
B.泥、砂同时沉积,分选极差
C.砾、砂、泥混杂沉积,分选极差
D.砾、砂、泥混杂沉积,分选好
参考答案:C
CD为Rt△ABC斜边上的高,AB=13,AC=12,则CD=______.
3.In nature some animals actively defend the area_____________they depend for the resources.
A.in which
B.on which
C.which
D.Where