Which one is sky-wave propagation? ( )
A: [img=349x171]18032253508af74.png[/img]
B: [img=363x137]180322535baed08.png[/img]
C: [img=372x202]1803225366a67f8.png[/img]
A: [img=349x171]18032253508af74.png[/img]
B: [img=363x137]180322535baed08.png[/img]
C: [img=372x202]1803225366a67f8.png[/img]
举一反三
- Which one is sky-wave propagation? ( ) A: [img=349x171]180366f4d015b23.png[/img] B: [img=363x137]180366f4db04345.png[/img] C: [img=372x202]180366f4e6d30e7.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]
- 令F(x):x是有理数,G(x):x是实数。将命题“所有的有理数都是实数,但有的有实数不是有理数”符号化为() 未知类型：{'options': ['17e0a83a4157352.jpgx(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))'], 'type': 102}
- 设f(x)的一个原函数是F(x) ，则[img=108x37]17e4423d9aa227d.jpg[/img]（ ） 未知类型：{'options': ['F(ax＋b)＋c', ' aF(ax+b)+c', ' [img=88x35]17e4423da4dc314.jpg[/img]', ' [img=97x33]17e4423dafb1816.jpg[/img]'], 'type': 102}
- 设f(x)的一个原函数是F(x) ，则[img=108x37]17e0c267c64cc7e.jpg[/img]（ ） 未知类型：{'options': ['F(ax＋b)＋c', ' aF(ax+b)+c', ' [img=88x35]17e0c267d30ea70.jpg[/img]', ' [img=97x33]17e0c267df9cbea.jpg[/img]'], 'type': 102}