设一经济有以下菲利普斯曲线：p=p-1-0.5（u-0.06）。问：（1）该经济的自然失业率是多少？（2）为使通货膨胀率下降2. 5个百分点，会产生多少失业？周期性失业是多少？（3）画出该经济的短期和长期菲利普斯曲线。
Among the following basic circuits, which one that does not belong to the volumetric speed regulation circuit. ()
A. Variable displacement pump and fixed displacement motor speed control circuit
B. Constant displacement pump and constant displacement motor speed regulation circuit
C. Speed control circuit of constant displacement pump and variable displacement motor
D. Variable displacement pump and variable displacement motor speed control loop
High speed circuit is often used in hydraulic machine tools to ().
A. increase the speed of working feed and improve the working efficiency of the system
B. increase the speed of the working mechanism when there is no load, and improve the working efficiency of the system
C. increase the machining speed of working mechanism and improve the working efficiency of the system
D. increase the oil pressure of the system to speed up the speed of working mechanism, and improve the working efficiency of the system
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