semi-malleable cast iron
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叶轮为三片单园弦弯叶，选用半封闭叶轮，并采用可锻铸铁、所以强度高，耐腐蚀；
Impeller for the three single-string bending garden leaves, use a semi-enclosed impeller, and the use of malleable iron, so high strength, corrosion resistance;
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