皮皮学，免费搜题
登录
搜题
【判断题】
共阳极数码管指的是a、b、c、d、e、f等各段连接着内部二极管的正极。A.
正确
B.
错误
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】我们生活的地球表面有一层厚厚的空气，它不仅起着调节气候的作用，同时还是人类和一切动植物的生命支柱。此外，空气还是人类进行生产活动的重要、廉价的自然资源，试回答： （1）随着现代工业的发展，人类在进行生活、生产活动中，改变了部分地区空气的成分，损害了人体健康，影响了作物的生长，造成对自然资源以及建筑物的破坏。造成空气污染的有害物质，大致可分为_______ 和________两大类。从世界范围看，排...
【简答题】P148 No.2 Economists in Funlandia,a closed economy,have collected the following information about the economy for a particular year. Y=10000,C=6000,T=1500,G=1700 The economists also estimate that the ...
【简答题】1) E____, the catalysts of biological systems, are remarkable molecular devices that determine the patterns of chemical transformations. They also mediate the transformation of one form of energy into...
【简答题】阅读下面科普短文，然后回答问题． 臭氧的化学式是O 3 ，在通常状况下是淡蓝色，有鱼腥臭味的气体． 臭氧不稳定，一旦受热极易转化成O 2 ，并放出大量的热．O 3 的氧化能力比O 2 强得多． 若将O 2 通过臭氧发生器，在无声放电条件下，从臭氧发生器出来的O 2 中含有约3%的O 3 ． 臭氧在地面附近的大气层中含量极少，在离地面约25km处有一个厚度极薄的臭氧层．臭氧层能吸收太阳辐射中的大量紫...
【简答题】Years ago, doctors often said that pain was a normal part of life. In particular, when older patients _ 1 _ _ of pain, they were told it was a natural part of aging and they would have to learn to l...
【单选题】Match the following formal review roles and responsibilities: Roles 1) Moderator. 2) Recorder. 3) Reviewer. 4)Manager. Responsibilities p) The person chosen to represent a particular viewpoint and rol...
A.
1Q, 2S, 3P, 4R
B.
1R, 2S, 3P, 4Q
C.
1Q, 2P, 3S, 4R
D.
1R, 2P, 3S, 4Q
【单选题】(p. 59) If customers believe they have multiple service providers to choose from for a particular service, or if they can provide the service for themselves, their levels of adequate service are _____...
A.
Lower than
B.
Higher than
C.
More volatile than
D.
More stable than
E.
The same as
相关题目：
参考解析：
知识点：
题目纠错 0
发布
