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- 四four
- 大量的乙烯醛(+)-18手舞台正推出一套为串联其余两个立体[三(3)、三(12)]聘用四郎住宅丙烷.With large quantities of the vinyl aldehyde (+)- 18 in hand, the stage was now set for the tandem introduction of the remaining two stereocenters [C(3) and C(12)] employing the Koga r eaction.
- 石油部第一工程公司根据探伤工艺的要求,对由日本新日本制铁(株)和石井铁工所(株)引进,球壳由66块板拼装而成,焊缝总长720m 的北京5000m~3液化气球罐的内外焊缝表面进行200%磁粉探伤。According to the requirments of inspecting works,the First Cons truction Company carried out 200%25 magnetic powder inspection for 720m inside and outside weld surface of 5,000m~3 spherical tank. The tank includes 66 shells introduced from Nippon Steel Corporation and lshii Iron Wrks Co,Ltd.
- 井well
- 四个tetrad
- 石的lithic
- 四年four years
- 四级four-stage
- 测井well logging
- 锆石zircon
- 四国Shikoku
- 井号number sign
- 石脑油naphtha
- 四大the four elements [earth, water, fire, wind]
- 井的phreatic
- 黑曜石obsidian
- 四部four-part
- 井下underground
- 水滴石穿persistent efforts can solve any problem
- 四处all over the place