小范畴是一种重要的常用范畴。一个范畴的全体对象一般地只成类而不是集合,当其对象类是一个集合时就称此范畴为小范畴。例如,R为实数集,将实数作为对象,当a≤b时,规定Hom(a,b)=φab;当a>b时,规定Hom(a,b)=∅,即得一小范畴,更一般地,任何有序集(甚至拟序集)按其序仿此都可得到一个小范畴。
多齿差摆线针齿行星传动近几年来在小速比减速机上,特别是在大功率速比小范畴的使用过程中得到广泛的应用。
The many teeth difference cycloid gear drive now is widely used in the low transmission ratio and big power in kilowatt specifically.
二齿差摆线针齿行星传动近几年来在小速比减速机上 ,特别是在大功率速比小范畴的使用过程中得到广泛的应用 。
The two teeth difference cycloid gear drive now is widely used in the small speedratio reductor transmission, especially during the heavy_power, transmission, small speedratio.
我们(选择球员)的尺度使我们走入一个小范畴, 糖尿病人吃什么好,所以致古并没有太多的球员走进我们的视野外。
Our criteria for players makes it a very small field and not too much has come up on our radar as yet.
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