由开关组成的逻辑电路如图4所示,设开关接通为“1”,断开为“0”,电灯亮为“1”,电灯暗为“0”,则该电路为 ( )。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧