爱斯坦的相对论认为万有引力是不存在的,是时空发生弯曲的结果。
参考答案:对
After the meeting was over, the secretary ________ the new worker to the manager's office.[ ]
A. aimed
B. pointed
C. guided
D. imitated
经肾脏排泄的离子型对比剂是()
A.胆影葡胺
B.碘必乐
C.优维显
D.碘苯酯
E.泛影葡胺