动画就是通过一系列相互关联的画面,让视觉形成连续变化的感觉,这利用的原理是。()
A.立体视觉
B.视觉错觉
C.视觉疲劳
D.视觉暂留
参考答案:D
— What did he think of the trip to Beijing last month?
— He had such a good time ________ he visited the Great Wall.
A.until
B.that
C.where
D.when
预后最差的骨肿瘤是()
A.未分化网状细胞肉瘤
B.骨肉瘤
C.原发性软骨肉瘤
D.骨巨细胞瘤Ⅱ级
E.骨纤维肉瘤