发布时间:2025-01-19 02:30:56
(1)∵ρ=mV,∴水箱内水的质量:m=ρV=1.0×103kg/m3×20m3=2×104kg;(2)水的重力:G=mg=2×104kg×10N/kg=2×105N,对水做的有用功:W有用=Gh=2×105N×10m=2×106J;(3)∵η=W有用W总,∴抽水机做的总功:W总=W有用η=2×106J50%=4×106J,∵P=Wt,∴抽水的...
我是内蒙古包头市人在包钢工作我想问一下住房公积金可以多长时间提取一次
2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56 2025-01-19 02:30:56