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【单选题】
双作用叶片泵的定子内环是( ),这种泵的瞬时理论流量均匀, 噪声( )。A.
过渡曲线、高
B.
圆、高
C.
过渡曲线、低
D.
圆、低
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C.
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【简答题】阅读理解 Six years ago, Eileen Doyle's husband, an engineer, took his four children up for an early morning cup of tea, packed a small case and was never seen or heard of again.Eileen was astonished a...
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