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【单选题】
关于摩擦的概念与应用,错误的是______。A.
滑动摩擦:两个物体接触面作相对滑动或具有相对滑动趋势时的摩擦
B.
滚动摩擦:一物体在另一物体上滚动时的摩擦
C.
静滑动摩擦与接触面积的大小有关
D.
滚动摩擦滚动轴承的摩擦系数远小于滑动轴承
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【单选题】Of all the areas of learning the most important is the development of attitudes. Emotional reactions as well as logical thought processes affect the behavior. of most people. 'The burnt child fears th...
A.
attitudes affect our actions
B.
teachers play a significant role in developing or changing pupils' attitudes
C.
attitudes can be changed by some classroom experiences
D.
the elementary school is a more effective milieu (环境) for developing wholesome attitudes than high school or college
【单选题】Of all the areas of learning the most important is the development of attitudes. Emotional reactions as well as logical thought processes affect the behavior. of most people. 'The burnt child fears th...
A.
attitudes affect our actions
B.
teachers play a significant role in developing or changing pupils' attitudes
C.
attitudes can be changed by some classroom experiences
D.
the elementary school is a more effective milieu for developing wholesome attitudes than high school or college
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