执行“与”运算的基本门电路。有几个输入端，只有一个输出端。当所有的输入同时为“1”电平时，输出才为“1”电平，否则输出为“0”电平。-Perform basic gate "and" operation. There are several input, there is only one output. When all the input for the "1" at ordinary times at the same time, the output for a "1" level, o