伺服力量和控制线寻址横跨扩展倒栽跳水提供另外的供给动力的选择和另外的伺服口岸当扩充电路板被安装。
The servo power and control lines are routed across the expansion header to provide additional powering options and additional servo ports when the expansion board is installed.
基于势流理论，考虑流场的可压缩性，首先利用积分变换导得了势流问题的一个动力学倒易定理。
A reciprocal theorem of dynamics for potential flow problems is first derived by means of the Laplace transform in which the compressibility of water is taken into account.
农业劳动力老龄化；土地资源利用效率；倒“U”型关系。
Agricultural labor force aging; Land resources use efficiency; Inverted "u" type curve.
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