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气吹式排种器
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气吹式排种器
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气吹式排种器
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pneumatic seed-metering device
气吹式排种器
以窝眼轮式排种器为基础,改进清种装置,以气流为清种手段的排种器(见图)。
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social network behavior
Social Network betweenness centrality
social network community
Social network governance
social networking
social networking service
social networking services
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social network platform
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social network view
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