楔形和梯形 的英文怎麼說
中文拼音 [xiēxínghétīxíng]
楔形和梯形
英文
pincushion,keystone or trapezoid-
The necessary condition has been obtained on forming rolling workpiece surface defect by means of upper - bound method and least energy principle
以此為基礎,並藉助于上限原理和最小能量原理,獲得了楔橫軋成形階梯軸時軋件表面缺陷形成的必要條件。
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