【سؤال روزانه】فرآوری عمیق ۲۰۱۶۰۶۲۳، سؤال تک‌گزینه‌ای: هدف از استفاده از لوله‌های U شکل در ساختارهای لوله‌کشی، چیست؟ ( )

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