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【Production Version】Daily Question 2018-7-13 (Multiple Choice)

2018-07-13View Original

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The working wheel of the turbine expander features a radial-axial flow impeller of ( ), which offers the advantage of high structural strength. (1) Open type (2) Semi-open type (3) Closed type 2
Reply #22018-07-13
the anser is (1)

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