4、三棱锥的侧面投影是（ ）。[img=196x356]180348fb3a4c858.jpg[/img]
A: [img=176x228]180348fb46131be.jpg[/img]
B: [img=190x232]180348fb5249e00.jpg[/img]
C: [img=180x222]180348fb5df3767.jpg[/img]
D: [img=186x222]180348fb68ec1c8.jpg[/img]
A: [img=176x228]180348fb46131be.jpg[/img]
B: [img=190x232]180348fb5249e00.jpg[/img]
C: [img=180x222]180348fb5df3767.jpg[/img]
D: [img=186x222]180348fb68ec1c8.jpg[/img]
举一反三
- 图中的力F对O点的矩为多少？[img=744x149]18036e09021933f.png[/img][img=685x233]18036e090d730fc.png[/img][img=735x315]18036e0919b7d9d.png[/img] A: 0，Fl, Fb B: Fl, Fb,0 C: Fb,Fl,0 D: Fl,Fb,0
- 图中的力F对O点的矩为多少？[img=744x149]18036264958edca.png[/img][img=685x233]18036264a0a5ed0.png[/img][img=735x315]18036264ac698ce.png[/img] A: 0，Fl, Fb B: Fl, Fb,0 C: Fb,Fl,0 D: Fl,Fb,0
- 图中的力F对O点的矩为多少？[img=744x149]1802f3fa5d08ce2.png[/img][img=685x233]1802f3fa67fe3e8.png[/img][img=735x315]1802f3fa7529558.png[/img] A: 0，Fl, Fb B: Fl, Fb,0 C: Fb,Fl,0 D: Fl,Fb,0
- 图中的力F对O点的矩为多少？[img=744x149]18035d1c6fd7961.png[/img][img=685x233]18035d1c7ab1df4.png[/img][img=735x315]18035d1c859b5d7.png[/img] A: 0，Fl, Fb B: Fl, Fb,0 C: Fb,Fl,0 D: Fl,Fb,0
- 图中的力F对O点的矩为多少？[img=744x149]1802f3f8b9285a5.png[/img][img=685x233]1802f3f8c4edd9d.png[/img][img=735x315]1802f3f8d15814b.png[/img] A: 0，Fl, Fb B: Fl, Fb,0 C: Fb,Fl,0 D: Fl,Fb,0