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 .
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。
Through single factor test initially set up a suitable for duck solid fermentation medium optimization formula: plus accessories for the bran, and adding 1.5% ammonium sulfate.
通过单因素试验，初步确定适于鸭粪固体发酵的培养基优化配方为：外加辅料为麸皮，并加入1.5%硫酸铵。
Seven duck plague virus strains are isolated and identified from seven different invasion districts in Sichuan Province with 9 to 10 day old duck embryo and cross-neutralization test.
用9～ 1 0日龄鸭胚和血清交叉中和试验从四川省七个疑似鸭瘟发病片区分离鉴定了七株鸭瘟病毒。
The virus was proved to be a Duck Plague virus by means of cell culture, neutralization test and PCR assay, and it was maybe a virulent virus.
四川成都某鸭场分离得到一株疑似鸭瘟病毒，经细胞培养、中和实验、PCR鉴定，证明分离株为鸭瘟病毒，毒力测定及动物实验表明其可能为强毒株。
The D1 isolate of goose paramyxovirus caused 100% mortality of goose, duck and chicken embryos. Infected allantoic fluid could produce high titer of hemagglutinin test.
鹅副黏病毒d 1分离株能致死鹅胚、鸭胚和鸡胚，致死率达到100%，感染的尿囊液能产生较高的血凝效价。
Test also systematically studied duck fermentation conditions, results showed that: the amount of matrix put, moisture, temperature, time had certain influences on the fermentation.
试验还对鸭粪发酵的影响条件进行了系统研究，结果表明：基质投放量、水分、温度、时间对发酵都有一定的影响。
Test also systematically studied duck fermentation conditions, results showed that: the amount of matrix put, moisture, temperature, time had certain influences on the fermentation.
试验还对鸭粪发酵的影响条件进行了系统研究，结果表明：基质投放量、水分、温度、时间对发酵都有一定的影响。
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