Letters of credit is conditional bank guarantee that Banks should be the buyer the requirements and instructions to guarantee a certain time or in the future to pay the seller a sum of money.
信用证是有条件的银行担保，是银行应买方的要求和指示保证立即或将来某一时间内付给卖方一笔款项。
2
In the ALU, we integrate the method of equinoctial node-group and conditionalsum adder to design reconfigurable ALU, and join negative logic circuit design design principle into it.