某项目有4种方案,各方案的投资,现金流量及有关评价指标见下表,若已知基准收益率为18%,则经过比较最优方案为()。
A.方案A
B.方案B
C.方案C
D.方案D
参考答案:D
— Football by the British at the beginning of last century.
— That's probably why football is one of popular games in England. [ ]
A. was invented, the most
B. invented, more
C. was invented, more
D. invented, the most
充满管道的流体经管道内的节流装置,流束将在节流件处形成(),从而使()增加,()降低,于是在节流件前后产生了静压力差。