题目内容
双作用叶片泵的转子与定子同轴安装，流量不可调，为定量泵。（ ）
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双作用叶片泵转子不可反转，为单向泵。（ ）
Identifying the causes of necrosis（Unit 1 Text A）In the text, six causes of necrosis are introduced and explained. Complete the following sentence with the statement about the cause of necrosis.derived from Clostridium welchii can causes cell damage amounting to necrosis.
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