题目内容

A compressible fluid is flowing through a pipe with a constriction. The diameter of the narrow section is 1/2 the diameter of the wide section. The density of the fluid in the narrow section is 3/4 the density of the fluid in the wide section. If the velocity of the compressible fluid is 3.600 m/s in the narrow section, then what is the velocity of the fluid in the wide section?

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

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Water is flowing through a pipe with a constriction. The diameter of the narrow section is one-third the diameter of the wide section. If the velocity of the incompressible fluid is 3.6 m/s in the narrow section, then what is the velocity of the fluid in the wide section?

A. 2.00 m/s
B. 0.80 m/s
C. 1.4 m/s
D. 1.0 m/s
E. 0.40 m/s

Water is flowing through a pipe with a constriction. The area of the narrow section is one-half the area of the wide section. If the velocity of the incompressible fluid is 3.2 m/s in the wide section, then what is the velocity of the fluid in the narrow section?

A. 6.4 m/s
B. 5.9 m/s
C. 5.0 m/s
D. 4.7 m/s
E. 4.2 m/s

操作题6-1：数据库12.10中存放着2004年商品零售价格指数资料，分为全国、城市与农村三项。每个总指数是通过综合十六个类指数得到的，以上年为100。问题：根据给出的权数，计算全国的"服装、鞋帽"类指数。该指数为(D)。

A. 102.98
B. 100.98
C. 103.1
D. 98.16

操作题6-1：数据库12.10中存放着2004年商品零售价格指数资料，分为全国、城市与农村三项。每个总指数是通过综合十六个类指数得到的，以上年为100。问题：根据给出的权数，计算全国的"服装、鞋帽"类指数。该指数为(D)。

A. 102.89B.102.09C.100.96D.98.16
B. 102.09C.100.96D.98.16
C. 100.96D.98.16
D. 98.16