Through dividing electronic expansion valve from evaporator system and based on constant gain of superheat open loop rule, the compensation theory of valve head was analyzed.

通过将电子膨胀阀与受控对象(蒸发器)细化分开来，并依据恒定开环增益准则从理论上分析了阀头补偿原理。

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The numerical control index head was adopted, so the milling machine can process the machine parts as the gear, the worm gear, with the digital loop control method, it has high processing precision.

配上数控分度头可以加工齿轮、蜗轮等复杂机械零件，同时应用数字化全闭环控制方法，使其具有很高的加工精度。

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The loss of efficient head of circulation pump in the primary loop of PWR will increase with the increase of resistance coefficient of JetPump under forced circulation.

强迫循环条件下，压水堆一回路主循环泵有效压头的损失随喷射泵阻力系数的增加而增加；

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Over the summer and the autumn, the chairman repeated the accusation of being kept out of the loop when there were major hiccoughs over the report into the allegations about the conduct of the head teacher, all of which Mr Wilby denied.

BBC: Cornwall