【سؤال روزانه】فرآوری عمیق ۲۰۱۶۰۶۲۶، سؤال تک‌گزینه‌ای: گاهی از پمپ‌های رفت و برگشت دوحرکتی یا سه‌حرکتی استفاده می‌شود با هدف ( )

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