【判断题】马可波罗是被载入中华世纪坛的中华历史壁画中的外国人
【单选题】In order to receive (transmit) desired messages, in NAVTEX system,:
A.
Transmitter power is limited to that necessary for coverage of assigned are
B.
The sensitivity of the receiver’s antenna should be limite
C.
Transmissions by stations in each NAVAREA are arranged in a time-sharing basis.
【判断题】(5)右腿驱动电路的主要所用是减少市电交流干扰。( )
【单选题】In order to receive a refund for faulty products, you have to turn in an original receipt and a______complaint form.