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全部答案（共2个回答）
中最小单位，也叫“位”
Byte=字节即1yte=8its,两者换算是1：8的关系
答: 东阿240g和250g哪个好
答: 中国人的数学理应比外国人好！ 这是我的个人观点，这在于中国人对数字的发音是单音，因此，对数字的记忆较为简单，提高了学习数学的效率！
而科学的发展，往往受制于社会...
答: 简而言之,概率论是属于随机数学的范畴,即研究随机现象的一门自然科学。
答: 补课是比较错误的方式。我一直到高中毕业没补过课。爸妈也不管我，随我学什么。我打游戏和化学都挺好。现在在大学读书，很深刻地感受到教育是钱买不来的。在实验室做小型的...
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相关问答：123456789101112131415扫二维码下载作业帮
3亿+用户的选择
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3亿+用户的选择
下列比较不正确的是（　　）
A．稳定性：H 2 O＞H 2 S
B．氧化性：S＞Se
C．还原性：H 2 S＞H 2 Se
D．微粒半径：S 2- ＞S
作业帮用户
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3亿+用户的选择
A、非金属性O＞S，则态氢化物的稳定性H 2 O＞H 2 S，故A正确；B、因主族元素，电子层越少，得电子的能力越强，电子层数S＜Se，则氧化性为S＞Se，故B正确；C、非金属性S＞Se，则还原性为H 2 S＜H 2 Se，故C错误；D、同种元素的原子和阴离子，阴离子的电子数多，则半径大，则微粒半径为S 2- ＞S，故D正确；故选C．
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扫描下载二维码What is second (s or sec)? - Definition from WhatIs.com
second (s or sec)
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A stateful app is a program that saves client data from the activities of one session for use in the next session. This data is called the application’s state.
The second (abbreviation, s or sec) is the Standard International (
) unit of time. One second is the time that elapses during 9,192,631,770 (9. x 10 9 ) cycles of the radiation produced by the transition between two levels of the cesium 133 atom.
There are other expressions for the second. It is the time required for an
to propagate 299,792,458 meters (2. x 10 8 m) through a vacuum. This figure is sometimes rounded to 3.00 x 10 8 m, or 300,000 kilometers (3.00 x 10 5 km). One second is equal to 1/86,400 of a mean solar day. This is easy to derive from the fact that there are 60 seconds in a minute, 60 minutes in an hour, and 24 hours in a mean solar day. This definition is, however, subject to limited accuracy because of irregularities in the earth's orbit around the sun.
Engineers and scientists often use smaller units than the second by attaching power-of-10
s. One millisecond is 10 -3 one microsecond is 10 -6 one nanosecond is 10 -9 one picosecond is 10 -12 s. During these spans of time, respectively, an EM field propagates through a vacuum over distances of approximately 300 kilometers, 300 meters, 300 millimeters, and 300 micrometers.
The second is sometimes specified as a unit of angular measure, especially in astronomy and global positioning. In these contexts, it is also known as an arc second or a second of arc, and is equal to exactly 1/3600 of an angular degree or 1/1,296,000 of a circle. Sixty arc seconds co 60 arc minutes comprise an angular degree. One arc second of latitude at the earth's surface corresponds to a north-south distance of only about 31 m.
Also see Standard International (
) System of Units and
Continue Reading About second (s or sec)
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