By contrast, multilayer shells bond device is designed which the T4280 twin columns coordinate boring lathe is used as the bond device labor flat roof.
经对比，提出利用T4280双柱坐标镗床作为研制粘接装置的工作平台，进行多层壳体粘接装置的总体设计。
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Results Twin pregnancy had more complications than singleton during in labor and puerperuim Conclusions Antenatal care should be enhanced in twin pregnancy.