如图所示水箱a中水始终保持50厘米的深度箱底有一小孔水通过小孔流入水箱b.小孔的横截面积为15厘米2孔下的塞子固定在杠杆的a点上当 Template




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tomski如图所示水箱a中水始终保持50厘米的深度箱底有一小孔水通过小孔流入水箱b.小孔的横截面积为15厘米2孔下的塞子固定在杠杆的a点上当 coloring