皮皮学，免费搜题
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【单选题】
液力变工作原理：是在泵轮液体循环流动过程中，固定的（）给涡轮一个反作用力矩，其力矩大小与作用方向随涡轮的转速而变化，从而使涡轮输出的转矩大于泵轮输入的转矩。A.
泵轮
B.
涡轮
C.
导轮
D.
叶轮
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参考解析：
知识点：
皮皮学刷刷变学霸
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A.
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