装饰用的小彩灯每个两端电压不允许超过10V,问至少要串联多少只灯,才能用家庭电路做供电电源.( )
A.20只
B.21只
C.22只
D.23只
答案:C
I went to the zoo yesterday. It me two hours there by subway.
A.spent, getting
B.took, to get
C.spends, to get
D.takes, to get
DSS开发和实现过程的管理方式将极大地影响实现的成功,下列哪项不属于其应考虑的问题()
A.高层管理支持
B.用户的义务
C.用户参与管理监督
D.制度化