《服务质量规范》空调列车规定：夜间作业、行走、交谈、开关门要轻。进包房先敲门，出包房时，转身离开。（）
16Mn母材中含有较高的S，P时，应如何保证焊缝的韧性
Refer to the exhibit. In the diagram, the switches are running IEEE 802.1s MST. Which ports are in the MST blocking state?（） ["GE-1\/2 and GE 2\/1","GE-1\/1 and GE-2\/2","GE-3\/2 and GE 4\/1","no ports are in the blocking state","There is not enough information to determine which ports are in the blocking state"]
《铁路旅客运输规程》行李、包裹的运到期限，从承运日起，包裹运价里程超过400千米时，每增加（）千米增加一日，不足400千米也按一日计算。 ["400","600","1000","1500"]
钢缆输送机设备与指标标准化的内容是什么？
钢缆输送机司修工应做到哪“三知、四会、五严格”？
