《动车组列车服务质量规范》儿童票标高线长（）毫米。 ["70","80","90","100"]
重介质悬浮液的稳定性含义是什么？
Refer to the exhibit. In the diagram，the switches are running IEEE 802.1w RSPT. On which ports should root guard be enabled in order to facilitate deterministic root bridge election under normal and failure scenarios？（） [" GE-3\/1， GE-3\/2"," FE-2\/1， FE-3\/2"," GE-1\/1， GE-1\/2"," GE-4\/1， GE-4\/2"," GE-2\/1， GE-2\/2"," GE-3\/1， GE-3\/2， GE-4\/1， GE-4\/2， FE-2\/1， FE-3\/2"]
简述异步串行通信协议
收入管理部门在审核列车班组申报的客运票据时，填发“票价订正通知书”用以订正（） ["交款不符","多、少收款","票价差错","票价表差错"]
简述整治水位确定方法。
