如图所示是一种自动测定油箱内油面高度的装置.1图中虚线框内的装置相当于简单机械中的杠杆杠杆2图中r是电学中的什么元件�动变阻器�动 Template




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tomski如图所示是一种自动测定油箱内油面高度的装置.1图中虚线框内的装置相当于简单机械中的杠杆杠杆2图中r是电学中的什么元件�动变阻器�动 coloring