(b) Which expression from the Riemann Sum definition of the definite integral signifies the eco-friendly shaded area? 所谓“值得做”，即指有理论价值，力求在理论和方法上有所创新，甚至对本学科发展有所贡献。要达到“值得做“的标准，毕业论文选题不仅需要具有较高的�
(b) Which expression from the Riemann Sum definition of the definite integral signifies the eco-friendly shaded area? 所谓“值得做”，即指有理论价值，力求在理论和方法上有所创新，甚至对本学科发展有所贡献。要达到“值得做“的标准，毕业论文选题不仅需要具有较高的�