resistance to contraction 抗收缩力
cold attributing to contraction 寒性收引
resistance e to contraction 抗收缩力
loss-of-head due to contraction 收缩管压头损失
headache due to muscular contraction 肌肉收缩性头痛
Loss due to sudden contraction 断面骤小损失
Airflow to maintain contraction 气流保持收缩
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