题目

The Best Western New Englander Location. It is located in Woburn, Mass., seven miles from Harvard University and the Salem Witch Museum. Tufts University and the Stone Zoo are four miles away. Downtown Boston is nine miles from the hotel. The US Constitution Museum is 10 miles away. Faneuil Hall, Fenway Park, Freedom Trail and the New England Aquarium are within 12 miles. Hotel Features. The Best Western New Englander offers complimentary breakfasts and suppers. The hotel includes 4,200 square feet of meeting and event space accommodating up to 200 people. The meeting rooms feature 11-foot ce如图所示，一箱苹果沿着倾角为θ的斜面，以速度v匀速下滑．在箱子的中央有一个质量为m的苹果，它受到周围苹果对它的作用力的方向A.沿斜面向上B.沿斜面向下C.竖直向上D.垂直斜面向上