A: 0.675 m/s
B: 0.805 m/s
C: 0.250 m/s
D: 0.333 m/s
E: 0.500 m/s
举一反三
- A compressible fluid is flowing through a pipe with a constriction. The diameter of the narrow section is 0.8000 the diameter of the wide section. The velocity of the fluid in the narrow section is 1.700 the velocity of the fluid in the wide section. If the density of the compressible fluid is 1.200 kg/m3 in the narrow section, then what is the density of the fluid in the wide section? A: 1.112 kg/m3 B: 1.256 kg/m3 C: 1.300 kg/m3 D: 1.333 kg/m3 E: 1.400 kg/m3
- 雷诺数取决于下列哪些因素( ) A: 特征尺寸Lc(characteristic length, m) B: 流体密度(fluid density, kg/m3) C: 特征速度V(velocity of the bulk fluid, m/s) D: 流体的动力粘度μ(dynamic viscosity, kg/m·s)
- 雷诺数取决于下列哪些因素( ) 未知类型：{'options': ['特征尺寸Lc(characteristic length, m)', '流体密度(fluid density, [img=50x27]18033f6a26f2543.png[/img])', '特征速度V(velocity of the bulk fluid, m/s)', '流体的动力粘度μ(dynamic viscosity,kg/(m·s) )'], 'type': 102}
- 雷诺数取决于下列哪些因素( ) 未知类型：{'options': ['特征尺寸Lc(characteristic length, m)', '流体密度(fluid density, [img=50x27]18033f6a68c3abd.png[/img])', '特征速度V(velocity of the bulk fluid, m/s)', '流体的动力粘度μ(dynamic viscosity,kg/(m·s) )'], 'type': 102}
- I’m looking for the _______ section in today’s paper.
内容
- 0
I’m looking for the _______ section in today’s paper. A: column B: combination C: com D: classified
- 1
I’m looking for the _______ section in today’s paper. A: column B: combination C: comb D: classified
- 2
Which section best explains why Sam 's asking so many questions in Section C? A: Section B B: Section D C: Section G D: Section I
- 3
Which of the following sections mainly points out that homes are a reflection of a person's social status? A: Section A B: Section E C: Section G D: Section H
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对于汉诺塔问题，假设盘子从上到下编号1，2，3，...，现在要把“s柱子上的n个盘子移到e柱子，m柱子为辅助。如果用(a,b,c)表示将编号a的盘子从b柱子移到c柱子，那么下面哪个列表表示3个盘子的解决方法？ A: [(1,s,e),(2,s,m),(1,e,m),(1,m,s),(2,m,e),(1,s,e)] B: [(1,s,e),(1,e,m),(3,s,e),(1,m,s),(2,m,e),(1,s,e)] C: [(1,s,e),(2,s,m),(1,e,m),(3,s,e),(1,m,s),(2,m,e),(1,s,e)] D: [(1,s,e),(2,s,m),(3,s,e),(1,e,m),(1,m,s),(2,m,e),(1,s,e)]