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。

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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。

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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。

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Johnson also picked up the wickets of Jonathan Trott, who registered his first duck in Test cricket, and Kevin Pietersen (36).

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Bradman wore the cap when he scored the last of his 29 Test centuries against England at Headingley in 1948, and then when he made a duck in his last Test innings against England at The Oval later the same year.

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Ganguly can at least console himself with the thought that he, like Sir Don Bradman, scored a duck in his final Test, and after 188 innings his final average was an impressive 42, although Bradman's, of course, was a remarkable 99.4.

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