当∑=90。时，称为（）锥齿轮，当∑#90。时称为非正交锥齿轮。A.相交 B.正交 发布时间：2019-11-05 06:16 │ 来源：www.tikuol.com 题型：单项选择题 问题： 当∑=90。时，称为（）锥齿轮，当∑#90。时称为非正交锥齿轮。A.相交B.正交C.直角
题型：单项选择题 阅读理解。 Best Sellers (畅销书) of the Week The New York Times This WeekTitle / Writer / Price / StoryWeeks on List(上榜周数) 1 The Forgotten Garden, by Kate Morton. $15.85. From Englandto Australia and back, two women try to solve a family problem. 182 The Help, by Helen Scott. $22.95. A young white man helps twoblack boys.583Spoken From the Heart, by Laura Bush. $30.00. Wife of U.S. President George W. Bush tells the stories of being the first lady. 244Best Friends Forever, by Carol Brown. $19.95. Childhood friendsmeet again years later when one needs help.6 5Run For Your Life, by James Clark. $27.85. A New Yorkpoliceman alone must stop a bad man killing people.101. The information about the Best Sellers of the Week is provided by __________. A. China Daily B. 21st Century C. The New York Times D. Washington Post 2. The book which has stayed on the list for the longest time is __________. A. The Forgotten Garden B. The Help C. Spoken From the Heart D. Best Friends Forever 3. Sarah is interested in the family life of American President. She can choose the book written by __________. A. Kate MortonB. Helen Scott C. Laura Bush D. Carol Brown 查看答案