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【单选题】
（）不是自动变速器中液力变的作用。A.
实现倒车
B.
连接发动机和机械传动装置
C.
防止发动机和传动系过载
D.
将发动机的输出转矩增大
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
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A.
stops
B.
stopped
C.
has stopped
D.
is stopping
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