To unify the magnetic field level of the whole area in Marine geomagnetism surveying, the base value of the secondarybase station must be reduced to the main base value.
海洋磁力测量多站日变改正中，为了使整个测区磁场水平统一，必须以主站为基准对分站日变基值进行归算。
2
The drag reduction of plane-surfaces with V-shaped grooves is given out by direct numerical simulation, and the drag reduction mechanism in the base of the secondary flow theory is suggested.
利用直接数值模拟方法求得平板上V—型条纹表面上的降阻情况，并给出基于二次流动理论的降阻机理。
3
This paper presented a new method for quantitatively analyzing the secondary data - base of WPI.