品牌使用者策略就是使用谁的品牌，通常使用的有本企业品牌、中间商品牌或者两者同时兼备。
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lesson 17 听一遍，选择正确答案
A. the pilot made a mistake in transmitting
B. the controller made a same answer in readback
C. the transmission was interrupted
D. the transmission was blocked
lesson 17 听一遍，选择正确答案
A. end of radar contact
B. radar contact lost
C. radar contact established
D. visual contact established
lesson17 听一遍，选择正确答案
A. radar failure
B. transmitter failure
C. receiver failure
D. transceiver failure
lesson17听一遍，选择正确答案
A. Transponder failure
B. Transmitter failure
C. Receiver failure
D. radar failure
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