鼠标单击开关切换开合状态
https://cc.xiaogd.net/?startCircuitLink=https://book.xiaogd.net/cyjsjdmw-examples/assets/circuit/cyjsjdmw-ch03-02-3-bit-adder.txt
原图
悬空用接地表示
另: Cin 表示 Ci, C 表示 Co
https://cc.xiaogd.net/?startCircuitLink=https://book.xiaogd.net/cyjsjdmw-examples/assets/circuit/cyjsjdmw-ch06-05-3-bit-adder-model.txt
https://cc.xiaogd.net/?startCircuitLink=https://book.xiaogd.net/cyjsjdmw-examples/assets/circuit/cyjsjdmw-ch06-06-3-bit-adder-demo.txt