单项选择题Professor Liu _____ all his students with his great knowledge of history.A. impressedB. excitedC. stirredD. touched
单项选择题在二个以上Inmarsat卫星覆盖的洋区,要注意什么问题?①注意入网登记的洋区是否是需要的洋区②不用关注,设备自动选择洋区③入网哪个洋区不影响通信 A. ① B. ③ C. ② D. ②③
