車床分類問(wèn)題

real_ynice

今天注冊(cè)個(gè)網(wǎng)站有個(gè)問(wèn)題要回答，看了之后難住了,，不知道答案是什么，看看有沒(méi)有大俠能夠解答下,。
Two very different types of lathes typically used to turn two types of materials...one natural, one manmade. What are they ?
& g: B4 \3 ]6 y# n1 n+ {. e) c

kobe愛(ài)學(xué)習(xí)

學(xué)習(xí)一下
: z* {  t7 H4 |) _/ A: D& ?* N- L2 l