油气藏内的油水界面与油层底界的交线称为（）。
A、外含油边界
B、内含油边界
C、油藏高度
D、含气面积
参考答案：B
_____ lacking in money, his parents, making their living by working abroad, managed to send him to
a key middle school.[ ]
A. Because
B. When
C. As
D. Though
《桔颂》所表现的精神是（）。
A、独立不迁
B、深固难徙
C、桀骜不逊
D、苏世独立
