单项选择题 The Charterers to have the benefit of any return insurance premium receivable by the Owners from the Underwriters by reason of the Vessel being in port for a minimum period of 30 days provided the Vessel be on hire. This indicates that return insurance premium is to be reimbursed by the Owners to（）.

问答题 行灯、电钻等移动式电气设备的火灾原因是什么？怎样预防？

问答题 日光灯的火灾的原因是什么？怎样预防？