下列选项中不属于侧脸的特点的是（）。 ["容观性","主观性","间接性","相对性"]
在声学中，把介质中某点的有效（）与质点振动速度的比值称为声阻抗率。 ["声强","声压","声幅","声频"]
经铁路以包裹托运摩托车按（）包裹办理。 ["一类","二类","三类","四类"]
Refer to the exhibit. You are setting up a 2-gigabit EtherChannel. Following IEEE standards， the exhibit shows your configuration in a local switch1. However， EtherChannel is not coming up. Which one of these statements could be a possible reason？（） [" EtherChannel is only available in Cisco equipment. "," The customer side is supposed to be running PAgP, which is a Cisco standard. "," PAgP is not an IEEE standard. VRRP should be used. "," The configuration on switch1 needs to be modified to use LACP.&e"]
当叉车货叉架和货叉起升到内门架的顶部时，叉车总高不变的门架称为（）门架。 ["自由起升","部分自由起升","全自由起升","单级"]
班级管理设计的基本要求有哪些？
