完成五棱柱被正垂面切割后的水平投影。[img=283x248]1803d0c36d0e3aa.jpg[/img]
A: [img=280x241]1803d0c376edd1d.jpg[/img]
B: [img=306x246]1803d0c381303ae.jpg[/img]
C: [img=277x247]1803d0c38c3f829.jpg[/img]
D: [img=277x246]1803d0c396708ea.jpg[/img]
A: [img=280x241]1803d0c376edd1d.jpg[/img]
B: [img=306x246]1803d0c381303ae.jpg[/img]
C: [img=277x247]1803d0c38c3f829.jpg[/img]
D: [img=277x246]1803d0c396708ea.jpg[/img]
举一反三
- 完成五棱柱被正垂面切割后的水平投影。[img=283x248]1803d74a8ea8591.jpg[/img] A: [img=280x241]1803d74a9b82f36.jpg[/img] B: [img=306x246]1803d74aa66d71e.jpg[/img] C: [img=277x247]1803d74ab07c358.jpg[/img] D: [img=277x246]1803d74ab9dbc69.jpg[/img]
- 设f(x)在|x|>;a上有定义,若___________,使得当|x|>;X时,恒有|f(x)-A|<;ε, 称[img=57x14]17de8197cad5b33.png[/img]时函数f(x)有极限A,记作[img=33x32]17de8197d6e5e38.png[/img][img=71x25]17de8197e309ab5.png[/img]。 A: 存在ε>;0, 存在X>;0 B: 任意ε>;0, 存在X>;0 C: 存在ε>;0, 任意X>;0 D: 任意ε>;0, 任意X>;0
- 下列4个集合中是空集的是() A: {x|[img=18x22]1802f060e2f728f.png[/img]+1=0} B: {x|[img=18x22]1802f060e2f728f.png[/img]<-x} C: {x|[img=18x22]1802f060e2f728f.png[/img]=0} D: {x|[img=18x22]1802f060e2f728f.png[/img]-1=0}
- 下列4个集合中是空集的是() A: {x|[img=18x22]1803d021d498831.png[/img]+1=0} B: {x|[img=18x22]1803d021d498831.png[/img]<-x} C: {x|[img=18x22]1803d021d498831.png[/img]=0} D: {x|[img=18x22]1803d021d498831.png[/img]-1=0}
- 下列4个集合中是空集的是() A: {x|[img=18x22]1803d0240bcad39.png[/img]+1=0} B: {x|[img=18x22]1803d0240bcad39.png[/img]-x} C: {x|[img=18x22]1803d0240bcad39.png[/img]=0} D: {x|[img=18x22]1803d0240bcad39.png[/img]-1=0}