How to shield the difference among the distributed heterogeneous database is the primary problem to be solved to implement the mutual visiting among the multiple databases.
如何屏蔽分布在不同站点上的异构数据库之间的差异，是实现多个数据库互访要解决的首要问题。
It is comprised of multiple stage centrifugal pump, double stage gas separator, protector, submersible motor, guard shield and setting gas separator.
它主要由多级离心泵、双级分离器、保护器、潜油电机、护罩、沉降分离器组成。
It is comprised of multiple stage centrifugal pump, double stage gas separator, protector, submersible motor, guard shield and setting gas separator.
它主要由多级离心泵、双级分离器、保护器、潜油电机、护罩、沉降分离器组成。
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