【单选题】If the local receiver of GPS is normal, but some equipments using GPS signal can’t get the signal, the possible malfunctioning equipment is ______.
【单选题】A By the time you read these words, winter should have gone within the Northern Hemisphere (半球). But at its worst, this winter was unusually cold. Here in New York City on January 31, the low temperat...
【单选题】Normally, pressurization problems are caused by a malfunctioning of the pressure outflow or the pressure regulating valves respectively, which allows the air to ______ out of the pressurized cabin.