4!???? - ????
...4?=24? 4????????????4?????????????? 4?=4x3x2x1=24. ???????? ??????????1?????n?=nX?n-1?x?n-2?x???x3x2x1????? ????????0???0?=1??? ????????0???????? ????? ?????????????· ......
https://zhidao.baidu.com/question/320039104.html
????4?????? - ????
...????4????????????4??????????reformprogress????????????????????????reformprogress???????????????????????????????????...
https://zhidao.baidu.com/question/2129887294784279147.html
??R1/4,Rc1/4,NPT1/4,G1/4,???????????????
...Rc1/4? ??????????????????1/4? ????? ????55°? ?????1:16? ??????19? ?????13.157??? ???11.445??? ???1.337??? NPT1/4? ?????????????????1/4? ????? ??????18?...
https://zhidao.baidu.com/question/148066183108655445.html
G1/4????????_????
...?G1/4?????????????13.157??????????????????????? ????????????????????????????G1/4??????11.445???...
https://zhidao.baidu.com/question/2215051167567351708.html
4??????????????_????
...4?????????????????????? ???????????????????300??????RGB???? ????????????????????????????????????? ??????????????????????...
https://zhidao.baidu.com/question/1995883647791997267.html
1??2??3??4??5????????????_????
...1??????25mm×35mm?2??????35mm×49mm?3??????54mm×84mm?4??????76mm×102mm?5??????89mm×127mm? 1?????????????????????????????? 2?????1????????????????????????????????????????? ......
https://zhidao.baidu.com/question/566182397564096532.html
4:3??????? - ????
...4?3???????800×600?1024×768?17?CRT?15?LCD??1280×960?1400×1050?20???1600×1200?20?21?22?LCD??1920×1440?2048×1536???CRT????? ??????????????????px?????????????????????????????????????????????? ......
https://zhidao.baidu.com/question/994050894253538019.html
G1/4??????? - ????
...1. ??G1/4???????11.694????????11.7????????????????? 2. ???????????? - G1/8?????8.8?? - G1/4?????11.7?????? - G3/8?????15.2?? - G1/2?????18.9?? - G5/8?????21?? - G3/4?????24.3?? - G1?????30.5?? - G1 ......
https://zhidao.baidu.com/question/1552566772090093547.html
3:4?????? - ????
...?3:4????????????????????????????????? ?????3:4?????2?????????????3cm×4cm ?????300?????????354×471???????2??????3.7cm×5.2cm ??????????????1??=2.54cm? ?????????????? ......
https://zhidao.baidu.com/question/1251979240998288019.html
??????????-????????????_????
...????????????????????????? ???????? ????????????????????????????????????????????????????????????????????? ???????? https://www.yunxiao.com ? https://yue.haofenshu.com??? ......
https://zhidao.baidu.com/question/532749414682692045.html