本文概述了桑蚕可动遗传因子的研究进展。
This paper reviewed the advance in mobile genetic element of mulberry silkworm.
介绍了U型钢可缩性支架缩动后的内力计算方法。
This paper gives the method of internal force calculation of U steel supports.
介绍了U型钢可缩性支架缩动后的内力计算方法。
This paper gives the method of internal force calculation of U steel supports.
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