annular preventer造句
1、HavetheHYDRIL[annularpreventer]pressure-testedto5,000psi.2、AdjusttheHYDRIL(annularpreventer)pressureto900psi....
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annular eclipse造句
Seeannulareclipsepictures.totalannulareclipseViewersasfarnorthasGreecewereabletoseeapartialeclipseduringtheJanuary15,2010,annulareclipse.Itwasreportedthattherewouldbeanannulareclipsetomorrow.Wehavecho...