Beijing Capital International Airport uses wireless digital trunked communication system to ensure the efficient and smooth operation of the airport.
A.正确
B.错误
正确答案：正确
Beijing Capital International Airport uses wireless digital trunked communication system to ensure the efficient and smooth oper
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If the son of the dead is an official, he has to go home on leave and stay at home for（） year(s) without working or any social c
The Shanghai Metro has achieved full access to free WiFi on all the metro lines.
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