皮皮学，免费搜题
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【简答题】
Sentences arrangment. 1.We hope that you have not been inconvenienced, and that you will enjoy your purchase for a long time to come. 2.Thank you for your very courteous letter. 3.We are sending you another one at once-- doubly well packed, this time, to make sure it reaches you safely. 4.It was apparently damaged during shipment. 5.We are sorry the TV set arrived in poor condition.
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
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【简答题】质量分布在同一平面内的回转体,经静平衡后( )(一定、不一定、一定不)满足动平衡,经动平衡后( )(一定、不一定、一定不)满足静平衡;质量分布于不同回转面内的回转体,经静平衡后( )(一定、不一定、一定不)满足动平衡,经动平衡后( )(一定、不一定、一定不)满足静平衡。