该文分别采用Palmer干旱指数（PDSI）、单位灌溉面积用水量（GIQ）、单位面积粮食产量（PHGO）作为气候变化、农业用水和粮食生产具体度量指标，分析了中国1949-2005年PDSI、GIQ、PHGO年际变化特征...
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GIQ pneumatic high vacuum butterfly valve USES solenoid directional valve to change the direction of air passage, controls the actuating cylinder to drive the butterfly valve opened closed.
是通过电磁换向阀改变气路方向，控制执行气缸驱动蝶阀作启闭运动。
GIQ pneumatic high vacuum butterfly valve uses solenoid directional valve to change the direction of air passage, and controls the actuating cylinder to drive the butterfly valve opened and closed.
秦工生产的GIQ型气动高真空蝶阀是通过电磁换向阀改变气路方向，控制执行气缸驱动蝶阀作启闭运动。
GIQ pneumatic high vacuum butterfly valve USES solenoid directional valve to change the direction of air passage, and controls the actuating cylinder to drive the butterfly valve opened and closed.
GIQ型气动高真空蝶阀是通过电磁换向阀改变气路方向，控制执行气缸驱动蝶阀作启闭运动。
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