皮皮学，免费搜题
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搜题
【多选题】
曲轴主轴承响的原因有:A.
轴承与轴颈的间隙过大
B.
主轴承盖螺栓松动
C.
主轴承与座配合松动
D.
轴承润滑不良
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The teacher told the students _______ in class. [ ]
A.
not to talk
B.
no talk
C.
not talk
【简答题】A．TURN TALK OFF B．TURN TALK ON C．TURN ON D．SET TALK ON
【单选题】You'd better _____ in class, It's not polite. [ ]
A.
talk
B.
to talk
C.
not talk
D.
not to talk
【简答题】A．Talk with her teacher. B．Talk with her friend. C．Talk with her classmates. D．Talk with her father.
【简答题】二层交换机和三层交换机有什么区别?常见的交换机品牌有哪些?
相关题目：
【单选题】You'd better _____ in class, It's not polite. [ ]
A.
talk
B.
to talk
C.
not talk
D.
not to talk