external feedback type oscillator circuit 外反馈式振荡电路 external force feed 外槽轮排种器 extraction feedwater feating 给水回热加热 ..
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本文主要从两个方面对覆膜穴播机具进行分析：一是鸭嘴式成穴器的成穴机理；二是外槽轮式排种器的分析。
The test mostly analyse the film mulching hill-drop planter from two aspects: One is mechanism of duck-mouth type punching-opener, One is analyse of metering device .
它和外槽轮式排种器相比，在播种小麦、高粱、谷子和玉米时，其排种均匀性提高10 ~ 30%左右。
In compare with the external force feed type, the uniformity of dropping may be increased by 10-30% when sowing wheat, sorghum, millet and corn.
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