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THE DISTANCE MEASURING EQUIPMENT LOCKS ON AT 5 MILES. 测距设备(测距机简称 DME)锁定在5英里处。

ALOCK ON (v)LOCKS ONLOCKED ONLOCKED ON (常指使用用雷达跟 踪)锁定(v)

BTo find and stay on a target or signal automatically 自动找到目标或信号并 持续跟踪

正确答案:A (备注:此答案有误)

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