一张单层dvd光碟一般半径为60mm, 去掉中间的23mm,那么这张dvd光碟的面积约 为96平方厘米,单层dvd光碟的数据存储量约 是4.3gb,约合4617089843字节,素以平均每 平方厘米存储的数据量是48094686字节。
茶壶上有小洞,其实还有一定的道 理,因为当茶水通过壶嘴流出时,水会把壶嘴堵 住,空气进不来,茶水就倒不出来了,所以在茶 壶盖上设计这么个小洞,既不影响美观,又能让 空气进入茶壶,一举两得。
I have a big dog ane I love him very much .he has two round black eyes and his sense of hearing is sensitive .
His claws are like four plum blossoms .His tail always shakes and looks very cute .In the daytime ,he likes sleepping under the sunshine .
But at night ,he is careful and keeps like the doorkeeper guards .He is smart and always eat a lot .He is meek to me but when he meets strangers ,he will bark to them .
When I become tired ,he will come and lick my face with his tongue .when I am not busy ,he will play with me .He can give me so much happiness and now I can not leave him .I love my dog because he is one of my family numbers .
关羽曾过五关斩六将、三英战吕布、 单刀赴会、水淹七军,这不说明了他的聪明才智 和他的武功高强吗?
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