()是指无形货物或者服务的订货或者付款等活动。
A.直接电子商务
B.间接电子商务
C.全局电子商务
D.交易后的电子商务
参考答案:A
Tom pretended________it, but in fact, he knew it very well.
A.not listen to
B.not to hear about
C.not to have heard about
D.to be not listening to
预留电子不停车收费车道,主线收费站的入、出口收费车道总数不得少于()条
A.4
B.6
C.8
D.10