椭圆的长半轴是什么啊?是2a还是aRT

椭圆的长半轴是什么啊?是2a还是aRT works of art的复数形式works of art是单数还是复数?有没有a works of art还是a work of art? Master of Art与Master of Fine Art 的区别是什么?学设计一般是MFA 还是MA? 椭圆的2a指的是椭圆上任意一点到两焦点的距离和还是椭圆的长轴 “art room” 前面是用“a”还是“an”? 椭圆中,a是椭圆上一点到椭圆两焦点的距离,c是什么?b是什么? art.注意,是词性的art,不是美术的Art Do you have a art room 的答语是什么 英语翻译是China ceramic art 还是Chinese ceramic art 椭圆的实轴是2a还是2c? 有关纸的英文名称 cromo art papercromo art paper这是什么纸啊? Most doctors recognize that A an art as much it is a scienceB as much an art as it is a scienceC as an art as much it is a scinenceD much an art as it is a science 请问那个是对的,再请问一下此题考察的是什么,我应该查语法书的 椭圆上长轴指a还是2a? 艺术节的英文art festival还是the art festivalrt 已知椭圆的长轴和短轴求焦距?已知椭圆的长半轴长为a,短半轴长为b求焦距?是加还是减啊？ I like art best at school的同义句是什么是I like art very much at school还是I like art at school very much 英语翻译是翻译成an Art lesson还是an art lesson?还有美术教室怎么翻译?art的首字母要大写吗? 地球是圆的还是椭圆的?