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單項(xiàng)選擇題

關(guān)節(jié)腔是個(gè)密閉的腔系，呈什么狀態(tài)能夠有利于維持關(guān)節(jié)穩(wěn)定性？（）

A.開(kāi)放
B.低壓
C.高壓
D.負(fù)壓

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