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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TA field calibration method for power metering device is given. By calibrating the error of the reactive power metering, the error of active power metering can be indirectly calibrated.

本文给出了一种电能计量装置现场校验的方法，通过对三相电能表无功计量误差的校验，可以间接地求得其表计的有功计量误差。

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The installed oil-saving device can reduce the gaps of metering-orifices, limits flow, increases oil atomization, and thus saves oil.

装上本节油器，能缩小量孔的间隙和限制流量，增加油的雾化从而达到节油效果。

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Sprint offers Truly UnlimitedSM 4G LTE data, text and calling to any mobile device with no metering, no throttling, and no overages, all while on the Sprint network, making it the ideal carrier for customers who want to use every single feature of their Galaxy S 4 every single day of the month without worry.

ENGADGET: Samsung Galaxy S 4 priced at $150 on Sprint and T-Mobile, hits both carriers in late April