OSN3500/2500/1500支持()和()。
参考答案:12个环形复用段保护组;40个线性复用段保护组
Personal computers _______ in 1976. It has changed the whole world. [ ]
A. have been invented
B. are invented
C. were invented
D. invented
每次进行会阴局部热敷的时间,正确的是()。
A.3~5分钟
B.6~10分钟
C.20分钟以内
D.20~30分钟
E.>30分钟