г¼Ǿͷдf=2.9mm12ʲô˼

г¼Ǿͷдf=2.9mmʲô˼𡱣f=2.99mmǹȦֵΪ2.99mm˼г¼ǾͷҲйȦfʾ...


ÿ̶ȳһ1.0mı˿,Ȧij2.99cm...

˿ÿȦܳ100/24Ȧ=4.167 ˿Ȧİ뾶R=4.167/(2)=0.663 ˿뾶r=2.99/24=...


ȯȯʽ2.99%,ζʲô...

ζźͿͻճɷȣһͻͻ׬ȯ̾Ϳ׬ΪͻʩõijƱʱ


2.99ʲô?8.8ڵķ,ƨ

Ī ijŮ͵˰ 2.99 ڡôĿķ2ǰ Ů 8.8 ķΪ...


֣ˬ2.99,Ѱ涨ȫ,һ90󡱵...

827磬һذϢȦ㷺֣ˬ2.99ڡ֣ˬϢһֱ...


... 2.99 Ԫ,ЩϢֵùע?

ȦҲDZȽϡԡˣܾг̣Ҳ̫֡Ϊܾ...


һ40׵˿Բ,Ȧ7.1,Բ̵...

ֱ3


2021Ȧ󶯵,Ƿ׷ױ,...

3嫣޴ߣΪշӡ켣Ȧһֱ²˺õĻᣬ...


...7179 , 2.99 Ԫ?ܻЩӰ?

ֻ˵йǵDzе̫ˣݹٷͨʾǰϺ˰ֵһѲ֣ˬ...


ȦĴһһô˰...

1901.9.72021.8.27첻˵ϣ˵˵й120ı仯ȦӰǰľ...