公文区别于其他信息记录的特点是( )。
A．传递权威信息
B．书面文字材料
C．具有法定权威与现行效用
D．有特殊的格式、文字要求
参考答案：C
According to the passage, why would the landowners respond to environmental concerns a. They wish to stimulate economic growth. b. They wish to improve their public image. c. They have a tradition of cooperating with the government. d. They are afraid of federal legislation.
衡量凝汽式机组综合性经济指标是（）。
A、热耗率；
B、汽耗率；
C、相对电效率；
D、煤耗率。
