LTE高铁覆盖采用的天线应具备以下哪些特性()。
A.低增益
B.宽波瓣
C.窄波瓣
D.高增益
参考答案:C, D
—There is something wrong with my car. I have to walk to the office tomorrow.
—Don't worry! I can ________ you ________ if you like.[ ]
A. pick; out
B. pick; up
C. take; up
D. bring; up
以下各项,属于椎动脉型颈椎病诊断依据的是()
A.有颈型颈椎病的临床表现
B.出现椎动脉供血不足的症状
C.椎动脉供血不足症状与头颈的位置有关
D.脑阻抗图提示椎动脉血流减少
E.X光平片显示颈椎退行性变化