费用效益分析法中的经济净现值是反映建设项目对国民经济所做贡献的 ( )指标。
A.绝对量
B.环境
C.经济
D.相对量
参考答案:A
钢管或复合管道系统试验压力下( )min内,压力降不大于( )MPa。
A.10,0.02
B.10,10
C.0.02,10
D.0.02,0.02
I the chair over to the window. Which of the following has the similar meaning with the underlined
word? [ ]
A. pushed
B. dragged
C. moved
D. passed