常见的典型地面微波通信系统包括（）和（）。
参考答案：长途微波通信系统；移动通信系统
Look, a group of students are playing the violin there, _______ their teacher as the conductor.
A．in front of them stand
B．in front of them stands
C．in front of whom standing
D．in front of whom stands
治疗内伤发热血瘀发热证的代表方是
A．通窍活血汤B．膈下逐瘀汤C．血府逐瘀汤D．桃红四物汤E．补阳还五汤
