【判断题】有疑问卷是指在问卷中回答不清或答案缺失的问卷,我们的处理方式为一是可以将此类问卷返给现场;第二种情况就是无法返给现场的问卷,审核人员可以考虑填补其缺失值。
【单选题】在研究数据中, 有一个变量“ 饮料类型” 有 4 个水平“ 果汁” 、 “ 碳酸饮料” 、“ 能量饮料” 和“ 其他” , 由于该变量的少量数据缺失, 那么缺失值用哪种填充方式会比较好?
【简答题】Digital video editing
【单选题】测得子镜片屈光度为+0.50DC×90,Add为+2.75DS,则主镜片屈光度为()
【简答题】______ is a device that converts images to digital format. A.Copier B.Printer C.Scanner D.Display
【单选题】装载机、推扒机、叉车、牵引车属于港口装卸机械的哪一类( )。
【单选题】下述哪项不是分枝杆菌属细菌的特性?( )
【单选题】DVD for Rent 1.A pay-for -play system for video DVD (digital versatile disc) will emerge by summer as an alternative, and possibly a competitor, to the DVD format currently available. 2.The new system...
A.
Booming business of Circuit City
B.
Superior quality of conventional DVD discs
C.
An introduction of the new system Divx
D.
Unlimited or permanent play of Divx discs
E.
Disk-play tracking and billing systems
F.
Expansion of the titles of Divx discs Paragraph 2______