按照护理学的概念,关于“环境”的叙述不正确的是
A. 环境包括内环境和外环境
B. 良好的环境能够促进人的健康
C. 人的内、外环境是动态和持续变化的
D. 人需要被动地去适应不断变化的环境
E. 内、外环境进行着物质和能量的交换
Foragearpump,
A. asoutputpressureincreases,overallefficiencydecreases
B. asoutputpressureincreases,overallefficiencyincreases
C. overallefficiencyisnotaffectedbyoutputpressure
D. noneoftheabove
Gearpumpscanbe
A. onlyfixeddisplacement
B. onlyvariabledisplacement
C. bothfixedandvariabledisplacement
D. noneoftheabove
Whatistherelationbetweenspeedandactualdisplacementforagearpump?
Actualdisplacementincreaseswithrotorspeeddown
B. Actualdisplacementdecreaseswithrotorspeedup
C. Actualdisplacementisconstantanddoesnotchangewithchangeinspeed
D. Noneoftheabove
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