甚高频地空通信电台,主用设备和备用设备的配置比例至少是1:2。
参考答案:错
The Harry Potter books are quite popular; they are in great ________ in this city.[ ]
A. quantity
B. progress
C. production
D. demand
肺胀偏虚者的病位主要在
A.肺、肾、脾、肝B.肝、肺、脾、心C.肺、心、肾、脾D.肺、脾、肝、胆E.脾、肾、胃、心