常见的外存储器有()
A.磁盘
B.内存条
C.磁带
D.光盘
参考答案:A, D
Five people won the“China's Creen Figure”award,a title to ordinary people for their
contributions to environmental protection. [ ]
A. being given
B.is given
C.given
D.was give
四格表中四个格子基本数字是()
A.两个样本率的分子和分母
B.两个构成比的分子和分母
C.两对实测阳性和阴性人数
D.一组绝对数和一组理论数
E.四个样本率或四个构成比