256×256形式表示的是（）
A.像素
B.视野
C.矩阵
D.像素大小
E.视野大小
参考答案：C
烧伤后肢体的抗挛缩体位不包括（）
A.肩关节外展
B.肘关节外旋
C.拇指外展
D.踝关节保持90°
E.双下肢外展
My sister met him at the Grand Theatre yesterday afternoon，so he ________ your lecture.
A．couldn't have attended
B．needn't have attended
C．mustn't have attended
D．shouldn't have attended
