Mixed nail are:a/the change of intensity in the receiver due to the change of climateb/The field intensity changes randomlyc/The field intensity fluctuations in a random way receiverd/The field intensity fluctuations in a random way receivers due to the impact of the weather.The main cause of nail phase:a/owing to the change of the refractive index media waves and multiple line effectsb/due to the effects of adjacent channel interference and the phenomenon of multiple line transmissionc/due to the interference of copper and distorted channels of transmissiond/jamming adjacent channel interference, copper and distorted channel
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