压力系数>1时,对应压力梯度为()
A: <0.01Mpa/m;
B: 0.01Mpa/m—0.0237Mpa/m;
C: >0.0231Mpa/m.
A: <0.01Mpa/m;
B: 0.01Mpa/m—0.0237Mpa/m;
C: >0.0231Mpa/m.
举一反三
- 某水泵运行时进口压力为0.05 MPa,排出口压力为0.25 MPa,则水泵的扬程约为________(设1 MPa≈100 m水柱高)。
- The average stress σm and stress amplitude σa of the alternating stress in the figure are respectively ( ).[img=239x154]17de8405f43ce66.jpg[/img] A: σm = 40MPa,σa = -120 MPa B: σm = -40MPa,σa = -40 MPa C: σm = 0MPa,σa = 120 MPa D: σm = -40MPa,σa = 80 MPa
- 原油压缩系数单位是()。 A: kg/m B: MPa C: MPa~1 D: MPa•s
- 井筒储集常数的单位是()。 A: m/Pa B: m/MPa C: MPa/m D: m.Pa
- 原油压缩系数单位是()。 A: kg/m<sup>3</sup> B: MPa C: MPa~1 D: MPa•s