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[主观题]
泵挂深度在800~1000m,防冲距约()。A.90cmB.110cmC.120cmD.130cm
泵挂深度在800~1000m,防冲距约()。
A.90cm
B.110cm
C.120cm
D.130cm
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泵挂深度在800~1000m,防冲距约()。
A.90cm
B.110cm
C.120cm
D.130cm
泵挂深度在600~800m,防冲距约()。
A.80cm
B.85cm
C.90cm
D.95cm
调防冲距高度一般应遵循的原则是100m泵挂深度其防冲距为()。
A.4~5cm
B.6~8cm
C.5~10cm
D.10~12cm
A.20
B.30
C.40
D.50