发布时间:2025-01-16 18:52:23
设规定时间为x
5000\x=5000\x+2+125
解x1=-10。 x2=8
-10舍掉
我小区的楼门锁是门一关就自动吸合在一起的请问这种锁最大能承受多大拉力
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