Which one is sky-wave propagation? ( )
A: [img=349x171]180366f4d015b23.png[/img]
B: [img=363x137]180366f4db04345.png[/img]
C: [img=372x202]180366f4e6d30e7.png[/img]
A: [img=349x171]180366f4d015b23.png[/img]
B: [img=363x137]180366f4db04345.png[/img]
C: [img=372x202]180366f4e6d30e7.png[/img]
举一反三
- Which one is sky-wave propagation? ( ) A: [img=349x171]18032253508af74.png[/img] B: [img=363x137]180322535baed08.png[/img] C: [img=372x202]1803225366a67f8.png[/img]
- Which one is sky-wave propagation? ( ) A: [img=349x171]18038cd871b6bc7.png[/img] B: [img=363x137]18038cd87cacc57.png[/img] C: [img=372x202]18038cd88818e30.png[/img]
- 设正态分布N(0, 4)的分布函数为F(x)，则F’(x) = ( ). A: [img=73x63]1802f2c47707b95.png[/img] B: [img=86x65]1802f2c47feb07a.png[/img] C: [img=75x58]1802f2c4884644b.png[/img] D: [img=87x58]1802f2c48fffbbf.png[/img]
- 设正态分布N(0, 4)的分布函数为F(x)，则F’(x) = ( ). A: [img=73x63]1802f2a8aba67a6.png[/img] B: [img=86x65]1802f2a8b46de33.png[/img] C: [img=75x58]1802f2a8bcdd988.png[/img] D: [img=87x58]1802f2a8c497bb0.png[/img]
- 设正态分布N(0, 4)的分布函数为F(x)，则F’(x) = ( ). A: [img=73x63]18031e92d8d1247.png[/img] B: [img=86x65]18031e92e1612dc.png[/img] C: [img=75x58]18031e92e9c3836.png[/img] D: [img=87x58]18031e92f20200d.png[/img]