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判断题

中国自1958年起建造了大量钢筋混凝土船和钢丝网水泥船，不能广泛用作趸船、内河及沿海中小型机动货船和内河驳船、农用船及渔船等。

单项选择题

 Which is not considered to be the three main communication links?

A．The incoming navigation signal from GPS satellites
B．One or more signals to notify other aircrafts
C．A two-way link
D．A wireless tether