When an error occurs within a nested TRY block, program control is transferred to the CATCH block that is associated with the nested TRY block.

当嵌套的TRY块中出现错误时，程序控制将传递到与嵌套的TRY块关联的CATCH块。

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The setting of welding parameters, involving stud lifting height, stud sending depth, lifting and sending speed and so on, can be accomplished by program control, thus the artificial error is reduced.

螺柱提起高度、送下深度、提起和送下速度等焊接参数的设定由程序控制，减少了人工调整的随机误差；

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Finally, the construction management control of the cable-stayed bridge, such as control program, control aims, error control and the usage of monitor machine are introduced.

最后介绍了斜拉桥的施工组织控制，将桥的控制程序、控制目标、误差限制以及施工中采用的几种监测仪器的使用做了分析。

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