研究了频域内半空间饱和土中单桩在瑞利波作用下的动力响应。
The frequency domain response of single pile embedded in half-space saturated soil and subjected to Rayleigh waves was investigated.
给料组件安装在铧犁机架上，不需另加驱动力，可以节省一个劳动力，而且化肥或种籽直接施于犁过的土沟内，不易被风吹走。
The fertilizer and the seeds are directly spread in a ploughed earth ditch, and are not easy to blow away by wind.
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