在调整阀门开关速度时，应通过执行器上的（）来均匀调节，不应限制进入的流量和过分限制排量，以防发生不稳定的运行。
参考答案：流量控制阀
下列投资方案评价方法中，不可以用独立方案选择的有（）
A．投资回收期法
B．内部收益率法
C．差额法
D．净现值法
E．最小公倍数法
Which of the following statements about closing a futures position through delivery is most accurate()
A. Delivery is also known as exchange for physicals (EFP).
B. Depending on the wording of the contract, a trader may close a contract by either delivering the goods to a designated location or by making a cash settlement of any gains or losses.
C. Although the popularity of physical delivery has decreased over time, delivery by cash settlement remains the most popular method of closing a futures position.
