皮皮学，免费搜题
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搜题
【多选题】
带传动的特点有（）A.
不需要张紧
B.
可以缓和冲击及振动，传动平稳
C.
过载时打滑，起到保护作用
D.
弹性滑动使传动比不稳定
E.
可用于两轮中心距较大的场合
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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