??????16mm F1.4 DC DN | Contemporary??E?????
...?????APSC?????????F1.4?????????????????????????16mm??????????C????????????????????24mm??????F1.4?????????????????F1.4??????????????...
https://www.zhihu.com/question/67128841
??????28-70mm F2.8 DG DN Contemporary???
...?????DN????????????????????????????????????????? ?????A7S3+??28-70 2.8??AF-C?????????????????????????????? ????????????????????????...
https://www.zhihu.com/question/445282359
? 150????DN???_????
...? 150????DN????????????????????????? ?? ?????????????? ????DN?????????????????????????????????????????????????????? ?????? ......
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???DN dn ?????? ?????????????????DN?????dn????????????
...DN dn?????????DN??????? dn????????????? ????????????? ???? GBT50106-2010 DN?dn???????dn???????DN???????????????...
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???????100-400GM???100-400DG DN ?????
...??100-400mm F5-6.3DG DN OS 1140g??????????????????????????????FE 100-400mm F4.5?5.6 GM ??????????????????????GM?????? ????????????? ??????????????????????????????...
https://www.zhihu.com/question/494361335
?????????DN150?DN?????150??_????
...DN???????150=150mm??????150mm???? ???????????????????????? ??????????????????????????????????????? ??????????????????????????????...
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???Dn=det (aij)???aij=|i-j|??????????_????
...???Dn=det (aij)???aij=|i-j|????????????????????????????????????????????????????????????????????????????????A= (aij)...
https://zhidao.baidu.com/question/1696918944287654428.html
???????????d?n?dn?w?nd????????
...HP??????n,dn,tn,dtn ?????? ?D?????????????????????????????????????????????? ?N????????????????????????????????????????? ?W?????HP Jetdirect 802.11b/g ?????????? ......
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??DN?De?dn?D?d????? - ????
...??DN?De?dn?D?d?????1?DN?De????1?????DN??????????De?????????2???????DN?????De??????3???????DN???????????De????????4...
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??DN???dn??? - ????
...DN?????DN??Nominal Diameter?????????????? ???????????????????????????????????????? DN????????????????????????????????????????????...
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