图示两均质细杆 OA 与 AB 铰接于 A ,在图示位置时, OA 杆绕固定轴 O 转动的角速度为 w , AB 杆相对于 OA 杆的角速度亦为 w , O 、 A 、 B 三点位于同一铅直线上。已知 OA 和 AB 两杆的质量均为 m ,它们的长度均为 L ,则该系统此时对 O 轴的动量矩大小 L O 为 ( ) 。
【单选题】The teacher said, 'My son had the same experience as the little boy.' The teacher said that his son had __ the same experience as the little boy. [ ]
【单选题】This paragraph is developed by ____________. The likeliness to get lower grades when skipped classes is another consequence. Whereas those who stay in class obtain at least some knowledge, even if the...
【简答题】Check-in Requirements: Passengers and their baggage must be checked in at least 45 minutes before departure for domestic flights and 60 minutes for international flights. Government-issued photo ident...