目测大概是80度左右，误差正负15度。 : ) 精确值测量一下3104 船头就知道了。

来源: Shubin 于 2025-08-13 11:51:17 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.