我永远不会忘记我父亲第一次将。22口径的枪放到我手里的情景。

Never forget the first time my father put a.22 in my hands.

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杰西卡·博兹曼，蒙大拿。亚伯克朗以及费区20口径并排式。“我永远不会忘记我父亲第一次将.22口径的枪放到我手里的情景。

Jessica, Bozeman, MT.Abercrombie & Fitch 20-gauge side-by-side."I'll never forget the first time my father put a .22 in my hands."

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提出了次镜支撑的偏置十字型中心结构，该结构具有较高的谐振频率，因此可以用于大口径望远镜中。

An offset cross structure for supporting secondary mirror is proposed. The structure has a higher resonance frequency so it can be applied to large-aperture telescope.

youdao

提出了次镜支撑的偏置十字型中心结构，该结构具有较高的谐振频率，因此可以用于大口径望远镜中。

An offset cross structure for supporting secondary mirror is proposed. The structure has a higher resonance frequency so it can be applied to large-aperture telescope.

youdao