卫星移动通信是指利用卫星转接实现()或移动用户与固定用户间的相互通信。
参考答案:移动用户间
The professor could tell by the ________ look in Maria's eyes that she didn't understand a single
word of his lecture. [ ]
A. cold
B. blank
C. innocent
D. fresh
细支气管不完全阻塞所致的阻塞性通气障碍可造成()。
A.肺不张
B.肺纤维化
C.支气管扩张
D.气胸
E.肺气肿