水泵叶轮后弯式叶片:当β1和β2均小于90°时,为叶片与旋转方向呈()叶片。A、径向式B、前弯式C、水平式D、后弯式
水泵叶轮后弯式叶片:当β1和β2均小于90°时,为叶片与旋转方向呈()叶片。
- A、径向式
- B、前弯式
- C、水平式
- D、后弯式
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单选题水泵采用的是()A前弯式叶片叶轮B后弯式叶片叶轮C径向式叶轮