The theory of medical microtron is introduced.The theory of medical runway microtron is expressed and its characteristics are compared with electron linear accelerator.
着重介绍了电子回旋加
器原理，重点介绍了跑道式电子回旋加器的工作原理，并对电子回旋加器和电子直线加器的特点进行了比
。
The theory of medical microtron is introduced.The theory of medical runway microtron is expressed and its characteristics are compared with electron linear accelerator.
着重介绍了电子回旋加器原理，重点介绍了跑道式电子回旋加器的工作原理，并对电子回旋加器和电子直线加器的特点进行了比。
Counterfort retaining walls are optimized in the paper, using the optimum program, costs of different counterfort retaining wall parameters were calculated and based on the contrast analysis.
本文对扶壁式挡土墙进行优化计算,利用优化设计程序对不同参数下的截面状态和工程造价进行分析比。
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