教育经费管理的功能是什么？

梯形是一种特殊的平行四边形。[ ]

市场细分是根据消费者的类别所进行的分类。

The National Education Department says again school safety has set off alarm bells with frequent serious

accidents _____ students got injured or even killed. [ ]

A. that

B. when

C. in which

D. from where

在HFC网络系统结构中，Cable MODEM接收到的以太帧被封装在某一时隙中，经（）调制后，通过HFC网络的上行信道传送给CMTS。

A．QAM

B．QPSK

C．GMSK

D．DMT

黄疸