如图所示a和b两个物体通过细绳和弹簧测力计连接在一起保持静止若a重3nb重5n不计弹簧测力计及绳子的重力则弹簧测力计的示数和地面对b Template




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tomski如图所示a和b两个物体通过细绳和弹簧测力计连接在一起保持静止若a重3nb重5n不计弹簧测力计及绳子的重力则弹簧测力计的示数和地面对b coloring