1) What are the different kinds of service?
发球方法有几种？
2) How many kinds of passes are there?
传球有几种。
3) How many kinds of basketball tactics are there?
篮球战术有几种？
4) several extraction methods
几种提取方法
5) Several kinds are offered.
有几种呢。
6) On several solutions of limit
求极限的几种方法
补充资料：发球
球类比赛时，一方 把球发出，使比赛开始或继续。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条