其实，语义上a half hour和half an hour也还是有点差异的。half原始语义是part或side，并非“精确的一半”。现代英语中，half通常理解成30分钟，但还是有不精确的定势。half冠上不定冠词a，尽管依旧不定，但是实物款感更强一些。也就是a half比单独的half更接近0.5 hours，30 minutes，1800 seconds。比如 【例...
百度试题 结果1 题目There are 30 ___ in half an hour. A. minutes B. seconds C. months 相关知识点: 试题来源: 解析 [解答]A 考查名词辨析。句意:半小时有30分钟。根据句意结合选项:A 分钟;B 秒钟;C 月。故选A。 [分析]反馈 收藏
full duration of radioactivity. For example, if one starts with 100 grams of radium 229, whose half-life is 4 minutes, then after 4 minutes only 50 grams of radium will be left in the sample, after 8 minutes 25 grams will be left, after 12 minutes 12.5 grams will be left, and so ...
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1、long measure(长度单位):So fast are electronic computers that hours, minutes and seconds are all much too long to measure their speed. 电子计算机的运算速度快得难以用小时、分、秒计算。 2、half measure(折衷办法,姑息...
其实,语义上a half hour和half an hour也还是有点差异的。half原始语义是part或side,并非“精确的一半”。现代英语中,half通常理解成30分钟,但还是有不精确的定势。half冠上不定冠词a,尽管依旧不定,但是实物款感更强一些。也就是a half比单独的half更接近0.5...
life should get at least 30 minutes of aerobic12. A. minutes B. seconds exercise every day. You can take walks, run. C. hours D. days ride bikes and swim. You must keep the exercise time in your 11 . If you can't 13. A. lovely B. shy remember. your exercise won't be good...
The rate of decay of a radioactive material is expressed by the exponential decay formula. It uses the half-life value which is the time it takes for half of the substance to decay.Answer and Explanation: The model for the exponential decay is given by $$\...
When it moves from 12 to 1 to 2 to 3 to 4 to 5 to 6, it covers a total of 30 minutes (5 x 6 = 30). At the point of 6 on the clock, it is half past hour or half past clock. Now that we understand half past time, can you say what is half past one?
Repeat this process if the number of hours is still more than 12. If the number of hoursis equal to12 change AM to PM or PM to AM. Example: What time is 17 hours and 30 minutes after 3:30 AM? The sum of the minutes equals 60. Subtract 60 from the minutes and increase the hour...