Socket编程接口支持两种通信方式,即虚电路服务方式和()服务方式。
参考答案:数据报
Thanks for your help , I couldn’t finish the work in time .
A.with which
B.under which
C.without which
D.for which
鲜活易腐货物的运输需求价格弹性系数______。
A.较大 B.较小C.为零 D.不变