【单选题】桥梁总跨径是多孔桥梁中各孔( )的总和。
【简答题】A.He sees it as a wise act. B.He is very interested in it. C.He does not like to do it himself. D.He is uncertain about it.
【判断题】电子商务物流配送的虚拟性来源于网络的虚拟性
【单选题】He was very careless in his work, so he really __________ to be fired. [ ]
【单选题】以下哪一个网站是我国最早进行跨境交易的?
【判断题】电子商务物流配送的虚拟性来源于网络的虚拟性。