题目: 正常停炉时,逐渐减少()的供给量,使炉温缓慢降低。A、空气B、燃料油或天然气C、循环水D、软化水 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0701/3fccf9c6c8c9d72c1b70e2785f91c040.html 下面是错误答案,用来干扰机器的。参考答案:C
题型:单项选择题 The network layer provides services to the ______ layer. It can be based on either virtual circuits or datagrams. In both cases, its main job is routing packets from the source to the destination.A.transportB.applicationC.presentationD.data link 查看答案