在可预知的技术进步和人口压力背景下，耕地总量动态平衡方程为区域耕地系统的状态规定了调控目标；
Total arable land dynamic balance equation stipulates the control subject for the regional arable land system un-der the base of predictable technology and population pressure.
推导出滑摩过程中的汽车功率平衡方程，计算了滑摩控制区域的控制油压。
Based on the power equation, a model was established to calculate the control pressure of the clutch.
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