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佳木斯大学语言治疗学
节流膨胀的过程是不计流体位差等速度变化,可近似看作( )过程
·等温
·等压
·等焓
·等熵
流体作节能膨胀时,当μJ>0,节流后温度( )
·升高
·降低
·不变
相同的压力下,对外作功的绝热膨胀比节流膨胀温度降低程度( )
·大
·小
·相同
制冷剂进入压缩机时的状态是( )
·流体
·汽液混合状态
·饱和蒸汽或过热蒸汽
评价蒸汽压缩制冷循环的技术经济指标是( )
·单位制冷量
·制冷剂每小时循环量
·压缩机消耗功率
·制冷系数
蒸汽压缩制冷循环的性能与制冷剂的热力学性质密切相关,下列哪个条件不符合制冷剂选择要求( )
·沸点低
·冷凝压力低
·汽化潜热大
·较低的临介温度
吸收式制冷是消耗( )而实现制冷的目的
·功
·热能
·机械能
水在973.1K、2.5MPa时,Z(0)=0.898,Z(1)=0.08,ω=0.345,则其压缩因子Z为( )
·0.97
·0.944
·0.926
·1
一气体符合P=RT/(V-b)的状态方程,从V1等温可逆膨胀至V2,则系统的ΔS为( )
·RT㏑V2-b/ V1-b
·0
·R㏑V2-b/ V1-b
·R㏑V2 / V1
二元气体混合物的摩尔分数为y1=0.3,在一定的T、P下,,,则此混合物的逸度系数为 ( )
·0.8978
·0.9097
·0.9381
·0.9092
—May I help you You seem to have some trouble.( )—<u style="text-indent: 0pt; font-size: 0.85rem;"> </u>,thanks I think I camanage it myself.
· No problem
· There’s no way
· That’s all right
· All right
—The program is very popular.（）—.We all like it.
· That’s right .
· Not at all.
· It doesn’t matter
· You’re welcome
—We’ll travel to different places this winter vacatio. Enjoy your trip!( )—<u style="font-size: 0.85rem;"> </u>.
· The same to you
· Yes,I’d love to
· Me,too
· Very well,thank you
—I’m sorry I have brokethe chair.( )—<u style="font-size: 0.85rem;"> </u>.I caeasily get it repaireD.
· That’s true
· You’re welcome
· Never mind
· Sounds fun
—I want to put up the picture othe wall. Would you mind helping me with it( )—<u style="font-size: 0.85rem;"> </u>.With pleasure.
· Of course
· Of course not
· You’d better not
· Thanks
·等温
·等压
·等焓
·等熵
流体作节能膨胀时,当μJ>0,节流后温度( )
·升高
·降低
·不变
相同的压力下,对外作功的绝热膨胀比节流膨胀温度降低程度( )
·大
·小
·相同
制冷剂进入压缩机时的状态是( )
·流体
·汽液混合状态
·饱和蒸汽或过热蒸汽
评价蒸汽压缩制冷循环的技术经济指标是( )
·单位制冷量
·制冷剂每小时循环量
·压缩机消耗功率
·制冷系数
蒸汽压缩制冷循环的性能与制冷剂的热力学性质密切相关,下列哪个条件不符合制冷剂选择要求( )
·沸点低
·冷凝压力低
·汽化潜热大
·较低的临介温度
吸收式制冷是消耗( )而实现制冷的目的
·功
·热能
·机械能
水在973.1K、2.5MPa时,Z(0)=0.898,Z(1)=0.08,ω=0.345,则其压缩因子Z为( )
·0.97
·0.944
·0.926
·1
一气体符合P=RT/(V-b)的状态方程,从V1等温可逆膨胀至V2,则系统的ΔS为( )
·RT㏑V2-b/ V1-b
·0
·R㏑V2-b/ V1-b
·R㏑V2 / V1
二元气体混合物的摩尔分数为y1=0.3,在一定的T、P下,,,则此混合物的逸度系数为 ( )
·0.8978
·0.9097
·0.9381
·0.9092
—May I help you You seem to have some trouble.( )—<u style="text-indent: 0pt; font-size: 0.85rem;"> </u>,thanks I think I camanage it myself.
· No problem
· There’s no way
· That’s all right
· All right
—The program is very popular.（）—.We all like it.
· That’s right .
· Not at all.
· It doesn’t matter
· You’re welcome
—We’ll travel to different places this winter vacatio. Enjoy your trip!( )—<u style="font-size: 0.85rem;"> </u>.
· The same to you
· Yes,I’d love to
· Me,too
· Very well,thank you
—I’m sorry I have brokethe chair.( )—<u style="font-size: 0.85rem;"> </u>.I caeasily get it repaireD.
· That’s true
· You’re welcome
· Never mind
· Sounds fun
—I want to put up the picture othe wall. Would you mind helping me with it( )—<u style="font-size: 0.85rem;"> </u>.With pleasure.
· Of course
· Of course not
· You’d better not
· Thanks