叶轮有开式、半闭式和闭式三种，如图2 - 2所示。

Impeller are open, and closed three-Banbi, as shown in Figure 2-2.

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叶轮有开式、半闭式和闭式三种，如图2 - 2所示。

Impeller are open, and closed three-Banbi, as shown in Figure 2-2.

youdao