...内容为依据实验室项目需求来使用MongoDB聚合操作来将处理的数据存到集合中。 数据聚合 mongoDB的数据聚合使用了聚合管道（Aggregation Pipeline）和MapReduce。MapReduce将数据分两部分进行处理。
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钢骨架聚乙烯复合管道 steel skeleton polyethylene composite pipeline
尽管通常运行子shell将聚合的输出通过管道传递给单个命令，但您还可以使用子Shell对命令进行扩展，就像反勾号那样。
While it's common to run a subshell to pipe aggregated output to a single command, you can also use a subshell to expand a command in place, just like back ticks.
该新型复合管道是由金属、陶瓷、聚合物三层材料组成，通过反应加工工艺和反应浸渍工艺复合而成。
The newly developed composite piping that composed of three layers materials such as metal, ceramic and polymer was made by reactive processing technology and reactive impregnation technology.
论述了聚合物管道的主要特性、焊接工艺及其在半导体、制药和生物工程等行业内高纯或超纯物料输送方面的应用。
Expound main features, welding procedure and application of high purity and super purity stream-conveying in semiconductor, pharmaceutical and biology Engineering of polymer pipeline.
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