曲面[img=135x26]18036fdfd7197e3.png[/img]与[img=109x26]18036fdfdfc647c.png[/img]的交线,在yoz坐标面的投影柱面方程为( )
A: [img=88x26]18036fdfe868c5d.png[/img]
B: [img=98x26]18036fdff17a853.png[/img]
C: [img=96x26]18036fdff9c1c78.png[/img]
D: [img=106x24]18036fe00226e4e.png[/img]
A: [img=88x26]18036fdfe868c5d.png[/img]
B: [img=98x26]18036fdff17a853.png[/img]
C: [img=96x26]18036fdff9c1c78.png[/img]
D: [img=106x24]18036fe00226e4e.png[/img]
举一反三
- 曲面[img=135x26]18036fdfd7197e3.png[/img]与[img=109x26]18036fdfdfc647c.png[/img]的交线,在yoz坐标面的投影柱面方程为( ) 未知类型:{'options': ['', '', '', ''], 'type': 102}
- 设随机变量X、Y相互独立,且[img=265x35]1786a06017102c9.png[/img]则[img=170x38]1786a060264e037.png[/img]( )。 A: 2 B: 10 C: 26 D: 4
- xOy坐标面上的曲线[img=82x26]1803bbf204cb79f.png[/img]绕x轴旋转一周,所得的旋转曲面方程为( ) A: [img=88x26]1803bbf20cf1208.png[/img] B: [img=89x26]1803bbf21559fe6.png[/img] C: [img=88x26]1803bbf21dbee2c.png[/img] D: [img=96x26]1803bbf227da55f.png[/img]
- 已知随机变量X的分布函数为[img=136x49]1803b69024c8270.png[/img] ,则X的均值和方差分别为 A: E(X)=2, D(X)=4 B: E(X)=4, D(x)=2 C: [img=162x43]1803b6902cd8bfb.png[/img] D: [img=162x43]1803b69034d9ffd.png[/img]
- Which of the following propositions is false,set A = {x,x is an integer and[img=60x23]1803a1c6eebb7a3.png[/img]} ? ( ) A: [img=113x25]1803a1c6f77ce06.png[/img] B: [img=139x25]1803a1c7001fe79.png[/img] C: [img=51x22]1803a1c70863f61.png[/img] D: {x|x is an integer and |x| 4}[img=33x22]1803a1c711a7c63.png[/img]