没有直线L:和曲面z=x2-y22+z2在点(1,1,1)处的切平面∏,则直线L与平 发布时间:2022-09-04 00:49 │ 来源:www.tikuol.com 题型:单项选择题 问题: 没有直线L:和曲面z=x2-y22+z2在点(1,1,1)处的切平面∏,则直线L与平面,∏的位置关系是A.(A)B.(B) L∥∏.C.(C) L⊥∏.D.(D) L与∏斜交.
题型:单项选择题 选出错误并改正。( ) 1. We send this gifts to Danny. _____________ A B C ( ) 2. Lynn has a pen, but she wants one. _____________ A B C( ) 3. Danny is tired, he walks slow. _____________ A B C( ) 4. Now our Christmas tree will always have something Chinese in it. _____________ A B C 查看答案