某井井深3100m,垂直井深3000m,地层压力梯度10.5kPa/m,当在用钻井液密度是1.20g/cm3时,井底压差将有()MPa过平衡。(g=0.00981)
A. 35.3
B. 31.5
C. 3.8
D. 1.5
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开连锁店首先要有()。
A. 管理
B. 服务
C. 规格
D. 标准
A single-screw vessel going ahead tends to turn more rapidly to port because of propeller().
A. discharge current
B. suction current
C. sidewise force
D. thrust