在任何情况下，封井后都用压井管汇向井中泵入加重钻井液，达到控制井内压力的目的。
参考答案：错
I can’t understand _______ Apple’s iPad 2.
A. why are they so mad about. B. why they are 80 Bad about
C. how are they so mad about D, how they are 80 mad about
淋球菌为革兰阴性双球菌。
