But problems with Boeing's far-flung outsourced supply chain and engineering and quality-control issues have bedeviled the program.

但由于波音广泛外包的供应链出现问题，再加上工程和质量控制方面的问题，波音的787项目不得不一再推迟。

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The design and hardware structure and program engineering of PLC4 automatic control system in the double stands temper mill are described.

介绍了冷轧厂双机架平整机PLC4自动化控制系统的设计、硬件组成以及程序设计。

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Although approaches for the integrated passive and active vibration control (IPAVC) have been found in a lot of literatures, the program which can be used in pracitial engineering is still in short.

尽管主、被动一体化振动控制的研究已开展多年，具有工程意义的软件化工作还很少。

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