Draft allowances can be incorporated into dimensional tolerances or geometric tolerances only upon consultation with the foundry.
拔模斜度余量只有经与铸造厂商定后才能合并到尺寸公差或形位公差中。
Some data which are necessary for using elbow 12a and determining the main geometric parameters of the draft tubes with elbow 12a are given.
本文介绍有关推广应用12a窄高型尾水管的试验研究成果，给出了应用12a肘管和确定具有该肘管的尾水管主要几何参数所必需的一些数据。
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