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【简答题】
In this task, you will talk about the ways to live a greener life. You will have 45 seconds to prepare and one minute to talk about it.
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】一质量为m、半径为R的均匀圆柱开始时以角速度 绕其对称轴旋转,现将其轻轻放在水平桌面上释放,如图所示。已知圆柱与桌面之间的滑动摩擦系数为 ,则在圆柱开始作纯滚动之后 [ ]
A.
圆柱所受的静摩擦力的方向与其前进方向同向
B.
圆柱所受的静摩擦力的方向与其前进方向反向
C.
圆柱所受的静摩擦力为零
D.
条件不足,无法判定
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【单选题】With no one to in such a frightening situation, she felt very helpless. [ ]
A.
turn on
B.
turn off
C.
turn over
D.
turn to
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