根据主、左视图，选择正确的俯视图（ ）。[img=188x103]180343c054ca85e.png[/img]
A: [img=111x83]180343c05d14ee5.png[/img]
B: [img=111x83]180343c065aaafd.png[/img]
C: [img=111x83]180343c06d94ba4.png[/img]
D: [img=111x83]180343c07647540.png[/img]
A: [img=111x83]180343c05d14ee5.png[/img]
B: [img=111x83]180343c065aaafd.png[/img]
C: [img=111x83]180343c06d94ba4.png[/img]
D: [img=111x83]180343c07647540.png[/img]
举一反三
- 根据主、左视图，选择正确的俯视图（ ）。[img=188x103]180343d0e24d539.png[/img] A: [img=111x83]180343d0ea72138.png[/img] B: [img=111x83]180343d0f5cc0f1.png[/img] C: [img=111x83]180343d0fe42814.png[/img] D: [img=111x83]180343d105f2943.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]
- Which of the following propositions is false,set A = {x,x is an integer and [img=60x23]1803a1c503ffa04.png[/img]} ? ( ) A: [img=113x25]1803a1c50cc3162.png[/img] B: [img=139x25]1803a1c514e60ea.png[/img] C: [img=51x22]1803a1c51dd52ef.png[/img] D: {x|x is an integer and |x| <4} [img=33x22]1803a1c525cf1bd.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]
- 电路为（ ）进制计数器[img=1104x316]18032d4222ee55e.png[/img] A: 83 B: 82 C: 84 D: 85