题目内容
单吸泵是叶轮一侧有液体吸入口的离心泵。
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平衡鼓是个圆柱体，装在末级叶轮之后，随转子一起旋转。
While the four Ps help us remember the basics components of the ________, they don't have significant relevance in the marketing process.
Marketers define a ________ as any physical good, service, or idea that satisfies
Placing a product in a location where people will buy it is part of the marketing mix.
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