以孔隙性为主的碎屑岩，其含油面积占岩心面积的（）时，定为富含油。
参考答案：70%~95%
有关纬线的叙述，正确的是[ ]
A、所有的纬线都是半圆状
B、所有纬线长度都相等
C、所有的纬线都指示南北方向
D、所有的纬线都指示东西方向
______ were impressed by his performance. [ ]
A. All the people present that day
B. That day all present people
C. All present people that day
D. All that day present people
