variable pitch impeller
变螺距叶轮
以上为机器翻译结果，长、整句建议使用 人工翻译 。
In order to get a good performance on preventing cavitation, the impeller of magnetic driving pump is designed in low-NPSHR method and variable-pitch inducer is installed.
为了获得良好的抗汽蚀性能，对磁力泵叶轮采取低汽蚀余量设计措施，同时配置变螺距诱导轮。
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