然后，再将非退化二阶曲线到自身的双射为对合的充要条件推广到退化二阶曲线两相异点列的情形。
Then, the latter necessary and sufficient condition is generalized to the case for the two different point ranges of degenerate second order curve.
同拔出残根、直接修复和冠延长术相比，正畸(牙合)向牵引是一种简单、经济、实用的方法，值得在临床上推广。
Compared with root extraction, the direct restoration, and the crown lengthening by surgical procedure, the forced eruption is a simple, economical and practical method in clinical.
氨基酸螯合微量元素肥料用量少，成本低，肥效显著，宜在生产中推广。
Amino acid chelated microelement fertilizer can be widely broadcasted because of its low dosage, low cost and high efficiency.
我们将这种算子推广到具有逆对合对应的完备格上。
In order-reversing involution, complete lattice is calculated and general Pawlak operator is deduced.
其重合度比点嘀合齿轮大，接触强度和弯曲强度高，而且加工制造方便，因而能够普遍推广和应用。
Since there is a greater overlapping, a higher touch stress and bending stress, and also it is more convenient to manufacture, this trans...
其重合度比点嘀合齿轮大，接触强度和弯曲强度高，而且加工制造方便，因而能够普遍推广和应用。
Since there is a greater overlapping, a higher touch stress and bending stress, and also it is more convenient to manufacture, this...
其重合度比点嘀合齿轮大，接触强度和弯曲强度高，而且加工制造方便，因而能够普遍推广和应用。
Since there is a greater overlapping, a higher touch stress and bending stress, and also it is more convenient to manufacture, this...
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