On the other hand if you are still using Xcode 3 only to avoid the Xcode 4 learning curve it is time to make the switch.

从另一方面来讲，如果你仍然在使用Xcode 3只是为了免去Xcode 4的学习曲线的话，那么是时候做出转变了。

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Personal development with the VB version of the substation to complete pressure switch management software, can generate pressure curve, monitoring exceptions.

说明：用VB个人开发的完成版本的变电站内开关压力值的管理软件，能生成压力曲线，监视异常。

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Running conditions of parallel-connected variable and constant speed pump are discussed using pump performance curve, and the correct switch steps are pointed out.

利用特性曲线对变速泵与定速泵并联运行工况进行了讨论，指出其正确切换步骤。

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