问答题

桥梁碍航原因有哪些?

答案：桥梁碍航的原因可能包括以下几点：1. 设计问题：桥梁设计时未能充分考虑航道的未来发展趋势，导致桥梁净空高度不足，不能满足...

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A sweepstakes winner may select either a perpetuity of $2,000 a month beginning with the first payment in one month or an immediate lump sum payment of $350,000. If the annual discount rate is 6% compounded monthly, the present value of the perpetuity is
A、less than the lump sum
B、equal to the lump sum
C、greater than the lump sum
D、空

答案： C

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答案： Sulfinol法是一种用于脱除酸性气体（如二氧化碳和硫化氢）的化学吸收法。该方法结合了物理吸收和化学吸收的优点，使用了...