发布时间:2025-01-29 11:16:45
钢材密度按7850千克/立方米计算,
方通重量为:
(0.2X0.2-0.18X0.18)X1X7850
=59.66千克/米
=59.66公斤/米
索尼黑卡5充满电关机 一天左右就空电开不了机,并且每次更换电池都要重新设置系统
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