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Hidden arm type multipoint coal fines sampling device.
藏臂式多点煤粉取样装置。
youdao
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This paper reports the development of a soil gas sampling device.
本文报道了研制的土壤气体采集装置。
youdao
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This paper reports the development of a soil gas sampling device.
本文报道了研制的土壤气体采集装置。
youdao