指数衰减振荡函数[img=135x27]180353c7e84ffce.png[/img]的频谱为：
A: [img=151x43]180353c7f53f995.png[/img]
B: [img=151x43]180353c802ba27e.png[/img]
C: [img=151x43]180353c81106968.png[/img]
D: [img=151x43]180353c819b414f.png[/img]
A: [img=151x43]180353c7f53f995.png[/img]
B: [img=151x43]180353c802ba27e.png[/img]
C: [img=151x43]180353c81106968.png[/img]
D: [img=151x43]180353c819b414f.png[/img]
举一反三
- 设直线过点[img=55x25]18036ee43397f5d.png[/img]且方向向量取为[img=69x25]18036ee43c6b34f.png[/img]，则该直线的方程为（ ）． A: [img=151x43]18036ee444f31f1.png[/img] B: [img=151x43]18036ee44d8392f.png[/img] C: [img=151x43]18036ee455992b2.png[/img] D: [img=151x43]18036ee45de4f74.png[/img]
- 设直线过点[img=55x25]1802cfc44b75c14.png[/img]且方向向量取为[img=69x25]1802cfc4538b827.png[/img]，则该直线的方程为（ ）． A: [img=151x43]1802cfc45c34147.png[/img] B: [img=151x43]1802cfc4640aecd.png[/img] C: [img=151x43]1802cfc46c51db4.png[/img] D: [img=151x43]1802cfc4754e22b.png[/img]
- 设直线过点[img=55x25]1803653600805e9.png[/img]且方向向量取为[img=69x25]18036536090adee.png[/img]，则该直线的方程为（ ）． A: [img=151x43]1803653611b8141.png[/img] B: [img=151x43]180365361989733.png[/img] C: [img=151x43]180365362276879.png[/img] D: [img=151x43]180365362a2ea95.png[/img]
- 设直线过点[img=55x25]18039c9485f08f7.png[/img]且方向向量取为[img=69x25]18039c948ddabaf.png[/img]，则该直线的方程为（ ）． A: [img=151x43]18039c949664631.png[/img] B: [img=151x43]18039c949ee8dc7.png[/img] C: [img=151x43]18039c94a846185.png[/img] D: [img=151x43]18039c94b1874e7.png[/img]
- X~N(1,1), 密度函数为[img=37x25]18038fe689205b5.png[/img], 分布函数为F(x), 则（ ） A: [img=198x25]18038fe690a03ee.png[/img] B: [img=101x25]18038fe69af96aa.png[/img] C: [img=67x25]18038fe6a3b8e5b.png[/img][img=118x25]18038fe6ab93d6f.png[/img] D: F(x)=F(-x)