The technology uses deep penetration perforation charge with high perforation density and large perforation diameter and surging perforation with greater pressure differential.
它采用高孔密大孔径深穿透射孔弹和大压差抽吸炮眼清洗技术，不仅能提高油井产能，解除近井带污染，还可以改善防砂完井效果。
In the greenhouse, by conducting pot and field experiments, the diagnosis method of crop moisture content from variable differential in stem diameter of tomato was studied.
在温室条件下，盆栽和小区试验相结合，进行了用番茄株茎直径变差法诊断其水分状况的试验研究。
The study of oxide-aperture influence on threshold current and differential resistance shows that lower threshold current can be obtained with a smaller oxide-aperture diameter.
研究了氧化孔径对阈值电流和微分电阻的影响，结果表明较小的氧化孔径可以获得低的阈值电流。
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