《动车组列车服务质量规范》餐车对旅客供餐时，不在餐车逗留、闲谈、占用座席、陪客人就餐。
面筋的主要成分是（）。 ["蛋白质","脂肪","碳水化合物","纤维素"]
《动车组列车服务质量规范》客运乘务人员进出车厢时，面向旅客鞠躬致谢。
许可协议
The network administrator is trying to add Switch1 to the network， but the 802.1Q trunk is not coming up. Switch1 was previously tested in the laboratory and its trunk configuration worked fine. What are three possible causes of this problem？（） [" The trunking configuration mode on Switch1 is set to Off."," The trunking configuration mode on the other end is set to On."," The trunking configuration mode on the other end is set to Desirable."," Cisco Discovery Protocol is not running on the other end."," There is a VTP domain name mismatch."," Switch1 does not support 802.1Q"]
（跑步的）着地距离
