【判断题】SLA 法是第一个投入商业应用的快速成型技术。这种方法的特点是精度高、表面质量好。原材料利用率将近 100 %,能制造形状特别复杂(如空心零件)、特别精细(如手饰、工艺品等)的零件。
【单选题】The scientist __________ the experiment for half a year, but he _______ yet.
B.
made; hasn’t succeeded
C.
was making; didn’t succeed
D.
has been making; hasn’t succeeded
【判断题】设计素描的审美特点决定不了其造型观点的现代化和多样化。
【单选题】学术界一般认为清的兴起是从()年努尔哈赤创业开始的。
【单选题】要使网页中的某背景图片同时在行上和列上进行重复显示,则应使 CSS 中 background-repeat 的值设置成( )。
【简答题】设计素描的审美特点决定不了其造型观点的现代化和多样化。
【单选题】Most people are half optimists and half pessimists.
【单选题】Why didn't the man watch TV a lot when he was young?
A.
He had too many half-brothers, half-sisters, step-brothers and step-sisters at home.
B.
He didn't like to watch TV a lot.
C.
The TV set in his family was a black-and-white one.
D.
The TV set in his family didn’t work properly.
【单选题】要使网页中的某背景图片在行上进行重复显示,则应使CSS中background-repeat的值设置成( )。