【单选题】— Why don’t you go home now ? —OK. Let’s go. [ ]
【简答题】用555定时器组成施密特触发器,电源电压为5V,当5号引脚控制电压端外接4V电压时,回差电压为 。
【单选题】用555定时器组成施密特触发器,当输入控制端CO外接10V电源时,回差电压为( )。
【简答题】A: Well, we’ve settled the question of price, quality and quantity. Now what about the terms of payment? B: OK. A: What ways of payment do you accept? B: We only accept payment by irrevocable letter o...
【单选题】摩擦表面之间由润滑剂(油、脂、固体等)的一层薄膜隔开,但又未被完全隔开,这样的摩擦称为()。
【简答题】ok, now what about _____________________________? what are your views on that ____________ of life in that city?