hurricane
发表于 2025-3-25 04:21:12
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怕失去钱
发表于 2025-3-25 07:31:18
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Panacea
发表于 2025-3-25 13:33:13
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Hypomania
发表于 2025-3-25 19:54:26
Navigation at Sea,ices at the center and drawn around the axis. The angle of a cone at its apex is called the ., that is, 90° minus the latitude, so that if the angle of the cone is 90°, corresponding to the ., the latitude is 0°. To distinguish between the northern and southern hemispheres the latitude must be speci
fringe
发表于 2025-3-25 23:39:24
The Longitude Problem,ng that apparent rotation in time. It is ironic that the very cyclical motion of the sun and stars which have historically been the means of keeping time is the same motion that requires us to have the ability to transfer time in order to navigate; that is, we need a precise clock. If the local time
愚蠢人
发表于 2025-3-26 02:59:43
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险代理人
发表于 2025-3-26 07:15:14
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MAPLE
发表于 2025-3-26 08:46:38
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Biguanides
发表于 2025-3-26 14:11:16
Optical Frequency Oscillators: Lasers,d the theory of crystal optics had been studied since the nineteenth century. It is little wonder that as soon as Maiman reported laser action in a ruby crystal in 1960, there was an explosion in the number of published reports of laser action in different materials. Lasers are playing such a transf
defendant
发表于 2025-3-26 18:19:58
Radio Navigation, of Loran-C services in the USA; it marked the end of a half a century of service that Loran-C had provided to mariners. The termination date for the Canadian portion of Loran-C was August 3, 2010. It was expected that other nations may retain local versions of radio beacons and Loran-C, since they