The excel in low density oil-well cement main solution oil field low pressure, the low seepage, easy to leak the lost circulationquestion which in the stratum well cementation appears.
高强低密度油井水泥主要解决油田低压、低渗透、易漏失地层固井中出现的井漏问题。
2
One question raised is why the coins were not more thoroughly damaged when they were taken out of circulation.
还有一个疑问就是为什么在货币退出流通市场时没有被彻底毁掉呐。
3
This essay pass through compare of foreign realize circulation economy take taxation policy, analyse our country exist question of in this territory take measure at present.