试验表明金刚石—硬质合金复合球齿钻头是一种理想的钻进卵砾石层的钻头。
Test results show diamond enhanced tungsten carbide composite spherical crown button bits are the ideal bits in drilling cobble and gravel formation.
本文介绍的采用套管钻进和潜孔锤钻进相结合的复合性钻进工艺，有效地解决了在卵砾石层中钻进的难题。
Difficulties are encountered in drilling in boulder formation are efficiently eliminated by using of a combined drilling technique which combines casing drilling with DTH drilling method.
卵丘-卵母细胞复合物各组的卵母细胞生殖泡破裂发生率和第一极体排除率明显高于裸卵各组（P<0.05）。
Percentage of undergoing germinal vesical breakdown and PB1 extrusion in cumulus-oocyte complex groups was higher than that in denuded oocyte groups(P<0.05).
卵丘-卵母细胞复合物各组的卵母细胞生殖泡破裂发生率和第一极体排除率明显高于裸卵各组（P<0.05）。
Percentage of undergoing germinal vesical breakdown and PB1 extrusion in cumulus-oocyte complex groups was higher than that in denuded oocyte groups(P<0.05).
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