Unverified80% confidenceTradeoffTime unknown
抽气效率与操作省力程度成反比：大缸径泵抽气快但每次下压阻力大，小缸径泵省力但要压很多下。手臂力量弱者宜选带脚踏底座或杠杆省力设计的泵
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80%
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Long-term
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