毛毛电
发表于 2010-9-23 01:06
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来自: 中国–北京–北京 教育网/北京航空航天大学新主楼
本帖最后由 edward0102 于 2010-9-27 06:14 编辑
1、O
Takahashi Sky 90 II - 3.5" f/5.6 Fluorite APO Refractor OTA - 90mm air-Spaced doublet offers true f/5.56 apochromatic refractor design.
- The Takahashi Sky 90 II incorporates precision manufactured laboratory flourite elements, combined with low dispersion glass.
- Vacuumed hardcoated on all surfaces and internal knife-edge baffling for maximum contrast.
- The Takahashi Sky 90 II provides a 5.1° field of view on the long axis of 35mm photos.
- Ultimately portable at only 7 pounds in weight and 13.8" in length.
- The Takahashi Sky 90 II includes 2" rack and pinion focuser, adapters, finderscope block and retractable dewshield.
- Five Year Manufacturer Warranty.
2、O
参见http://www.buytelescopes.com/Products/2880-em-200-temma-2-jr-225x-goto-mount.aspx
EM-200 Temma-2 Jr. 225x GOTO Mount
Manufacturer : Takahashi
Part Number : TSM5120 EM-200 Temma-2 Jr. GOTO Mount, GOTO speed 225X. Provided with RS232C cable, ST-4 or ST-7 cable shaft encoders and first quality electric motors. The mount can operate in the Temma mode and in normal mode using the hand controller.
3、虽然我很想选e,但是请版主看一看这个链接到底是怎么回事http://binoculars.alege.net/Takahashi-Flourite-Apochromatic-Binoculars-22x60-Binocular.html
所以,我还是选c,因为版主的那个“纯”字看起来很像正确答案。
4、a
参见http://www.astronomy.com.cn/bbs/thread-121144-1-1.html
5、a
不用多说
(答對 3 題, 贈 MFB +12) |
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