中国科学技术大学的《微积分》课程教学有着光荣的历史和优良的传统。
The University of Science and Technology of China has a glorious tradition in its teaching of calculus.
然而，水压传动技术的应用必须以性能优良的水压元件为前提，而直动式水压溢流阀阀口的压力特性对水压控制系统有着重要影响。
This paper carries out the thorough analysis and research to the pressure characteristics of the water direct-actuated relief valves by experiment and simulation.
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