直管

straight tube的用法和样例：

例句

The tube can be provided in coils or cut to length.可以根据用户要求提供任意长盘管或直管。
The nonlinear vibration of the straight pipes of heat exchanger was analyzed based on the equivalent-linearized theory, and the control methods of vibration were pointed out.摘要利用等价线性化解析方法，分析换热器直管的非线性振动，并指出振动的控制方法。

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