... direction finding receiver 定向接收机 direct ionizing radiation 直接电离辐射 directionless pressure 静压力，流体静压力，无向压力 ...
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One special feature at the LED energy (power direct, indirect energy consumption), the second is almost no ionizing radiation, three improved space utilization.
LED的特色之处一是节能（直接功耗，间接耗能），二是基本无电离辐射，三提高空间利用率。
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