接地导线应采用有一定强度的钢芯导线。
依据华电集团《安全生产事故（事件）综合应急预案》，企业发生突发事件时应当采用何种报告方式？
A person who sees someone fall overboard should（）. ["call for help and keep the individual in sight","run to the radio room to send an emergency message","immediately jump in the water to assist the individual","go to the bridge for the distress flare"]
自动电话机、磁石电话机都是由总机提供电源。
在炎热气候条件下，浇筑混凝土有何要求？
何种气温条件下应按冬季施工办理？
