真空波长为1.55微米的激光，其振动频率约为多少？
A: [img=100x24]18030570c111099.png[/img]
B: [img=100x24]18030570cb39f8a.png[/img]
C: [img=100x24]18030570d3d8b87.png[/img]
D: [img=100x24]18030570dbb3637.png[/img]
A: [img=100x24]18030570c111099.png[/img]
B: [img=100x24]18030570cb39f8a.png[/img]
C: [img=100x24]18030570d3d8b87.png[/img]
D: [img=100x24]18030570dbb3637.png[/img]
举一反三
- 1803bcc990bec7f.png的逆变换为 A: [img=100x24]1803bcc998b447b.png[/img] B: [img=100x24]1803bcc9a13bb65.png[/img] C: [img=100x24]1803bcc9aa20857.png[/img] D: [img=100x24]1803bcc9b220945.png[/img] E: [img=92x24]1803bcc9ba7d029.png[/img] F: [img=93x24]1803bcc9c24db0a.png[/img] G: [img=93x24]1803bcc9ca91f72.png[/img]
- 象函数[img=70x44]18032eccdc95e07.png[/img],对应的原函数为 A: [img=92x24]18032ecce598a78.png[/img] B: [img=100x24]18032eccedac64d.png[/img] C: [img=100x24]18032eccf608853.png[/img] D: [img=106x24]18032eccff64842.png[/img]
- 微分方程[img=76x44]17e43a023f8027d.png[/img]的通解为() 未知类型：{'options': ['', ' [img=100x24]17e43a024fbc8cd.png[/img]', ' [img=100x24]17e43a025726726.png[/img]', ' [img=81x24]17e43a025ed653a.png[/img]'], 'type': 102}
- 设向量[img=100x24]17d604bd0412a37.png[/img]，[img=100x24]17d604bd13cacf9.png[/img]，则向量[img=47x21]17d604bd22a413d.png[/img]（ ）. 未知类型：{'options': ['', '', '', ''], 'type': 102}
- 1802eb2c13858d4.jpg电路原来已经达到稳态，t=0时开关闭合，则[img=40x25]1802eb2c1c6999f.png[/img]为 A: [img=100x24]1802eb2c24c6935.png[/img] B: [img=100x24]1802eb2c2cd2f88.png[/img] C: [img=93x24]1802eb2c352fa04.png[/img] D: [img=93x24]1802eb2c3dd8e41.png[/img]