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[单选题]
某井井深H=5000m,气侵前钻井液密度1.20g/cm3,气侵后返至井口的钻井液密度0.60g/cm3,Ps=0.0981MPa,井底钻井液柱压力减少值()
A.0.627MPa
B.1.627MPa
C.0.601MPa
D.0.501MPa
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.0.627MPa
B.1.627MPa
C.0.601MPa
D.0.501MPa
第8题
A.4.6
B.5.6
C.6.6
D.7.6
第10题
A.40
B.50
C.60
D.70
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