()是将分类对象按其特征分成若干个面,再把每个面内的类目排列的顺序代码加以组合而形成代码的一种方法。
A.顺序编码法
B.层次编码法
C.平行编码法
D.混合编码法
参考答案:C
The light in his office is out. He_________ left for home.
A.must have
B.must have been
C.should have
D.should have been
我国体操运动员李宁在第六届世界杯体操比赛中,一举夺得几块金牌?