经营者必须经授权才能采取的经营形式包括（） ["特约经销","总经销","总代理","专卖"]
何种气温条件下应按冬季施工办理？
脉冲间隔发生器的作用是送出一个标准选号脉冲。
A person who observes an individual fall overboard from an OSV should（）. ["immediately jump into the water to assist the individual","call for help and keep the individual in sight","run to the radio room to send an emergency message","go to the control room for the distress flare"]
消防用水量如何计算？
在炎热气候条件下，浇筑混凝土有何要求？
