The flexural deformation equation of the lower part of the drillstem assembly during initial bending is derived by using the elastic deformation principle and trigonometric progression.是什么意思_The flexural deformation equation of the lower part of the drillstem assembly during initial bending is derived by using the elastic deformation principle and trigonometric progression.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句