...；换能器；收发电路；近距离测试 [gap=1069]Key words: ultrasonic; transducer; driven circuit; measurement of near distance ...
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飞行测试即将结束，我们再回过头近距离观察一下机场跑道上的这架在空中飞行了3小时39分钟的RC501。
Eventually the inside tour came to an end and it was time to get back to the runway to watch RC501 touch down after three hours and 39 minutes in the air.
在受害者身上进行的GSR测试能标示出受害者是否遭到近距离射击，而其他人衣物上的GSR测试则能锁定嫌疑人。
GSR on the victim can indicate a close shot, and GSR on anyone else can indicate a suspect.
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