“大王失职入汉中秦民无不恨也”中的“恨”的意义是()。
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人在炎热环境进行体力活动时,动—静脉短路常处于()。
空调工况下制冷剂的蒸发温度为()℃,冷凝温度为()℃。
Which of the listed conditions can lead to cavitation气穴in a centrifugal pump?()
A. Vapor pockets formed in the suction flow stream
B. Rough easing volute surfaces
C. Worn wearing rings
D. Heavy fluid in the flow stream