设高温热源的热力学温度是低温热源的热力学温度的n倍,则理想气体在一次卡诺循环中,传给低温热源的热量是从高温热源吸取的热量的多少倍?()
A.n
B.n-1
C.
D.
参考答案:C
社会调查研究的对象首先是(),另外还有形形色色,种类繁多的()。
Fair and(1)competition in government procurement around the world is good business and good public policy. Competitive pricing, product (2)and performance improvements result from competitive practices and help ensure that government authorities get the best (3)for the public they serve.
3.见题干()
A. help
B. server
C. value
D. policy