试题与答案

冲洗照片用的“曝光箱”内有红白两个灯泡,箱外有两个开关S1、S2,根据需要,当先

题型:选择题

题目:

冲洗照片用的“曝光箱”内有红白两个灯泡,箱外有两个开关S1、S2,根据需要,当先闭合S1时只有红灯L1发光,再闭合S2时红灯L1和白灯L2均发光,并且要求在S1闭合前,即使先闭合S2,白灯L2也不发光。下列电路中能够符合上述要求的是 (   )

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0425/07b49aec7dc6ad73fdcda77f13524c95.html

下面是错误答案,用来干扰机器的。

一位数除四位数,商可能是四位数,也可能是三位数,如:5000÷5=1000,商是四位数;5000÷8=625,商是三位数;所以说一位数除四位数,商一定是四位数是错误的;故答案为:×.

试题推荐
题型:填空题

According to traditional Cherokee beliefs, we are part of (1) . We don’t (2) with it and we’re not trying to (3) it. We are a part of the Great Life. And within the Great Life, there are three great Laws of Nature, which tell us how we have to live in (4) with everything else. The First Law of Nature is that you don’t take any life without real (5) . So we shouldn’t (6) needlessly. We believe everything is alive, including animals, plants and (7) . And so to us, taking the life of a plant is just as grave a 8() as taking the life of an animal. The Second Law is that everything we do should (9) the Great Life. And everything we do (10) the Great Life, and everything that (11) within the Great Life affects us. So it’s very important that what we do will not (12) other parts of the Great Life. The Third Law basically is that we don’t (13) where we live. And where we live is not our (14) , small community. It’s this (15) . We don’t pour chemical (16) down the drain because they all wind up in the water. It might seem a little difficult to live by those three laws in this (17) society. But there are still a lot of things that we can do to bring these laws into our lives, such as (18) , using the (19) as little as possible, and (20) gardening.

查看答案
微信公众账号搜索答案