140.数字电路从整体上看可分为几大类？
["\u7b54\uff1a(1)\u3001\u6309\u96c6\u6210\u5ea6\u5206\uff0c\u6709\u5c0f\u3001\u4e2d\u3001\u5927\u3001\u8d85\u5927\u3001\u751a\u5927\u89c4\u6a21\uff1b(2)\u3001\u6309\u7ed3\u6784\u5de5\u827a\u5206\uff0c\u6709TTL\u3001CMOS\u96c6\u6210 \u7535\u8def\u3002"]