皮皮学，免费搜题
登录
搜题
【简答题】
选择下述题中给出的四个结论中一个正确的结论． 设函数f(x，y)在点(0，0)的某邻域内有定义，且f x (0，0)=3，f y (0，0)=-1，则有______． (A) dz| (0，0) =3dx-dy (B) 曲面z=f(x，y)在点(0，0，f(0，0))的一个法向量为(3，-1，1) (C) 曲线 在点(0，0，f(0，0))的一个切向量为(1，0，3) (D) 曲线 在点(0，0，f(0，0))的一个切向量为(3，0，1)
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】完形填空。 Billy is a boy of fif. His parents died three years ago. One day when he was walking in the street, he 1 a wallet (钱包). He returned it to the owner, Mr. Baker. He gave his 2 to the boy. As t...
【简答题】完形填空。 Billy is a boy of fif. His parents died three years ago. One day when he was walking in the street, he 1 a wallet. He returned it to the owner, Mr Baker. He gave his 2 to the boy. As the boy...
【简答题】Billy is a boy of fif. His parents died three years ago. One day when he was walking in the street, he a wallet. He returned it to the owner, Mr. Baker. He gave his to the boy. As the boy had no j...
【多选题】小儿神经反射的发育包括哪几种类型（）
A.
出生时即有，终生存在的反射
B.
出生后即有，暂时存在的反射
C.
出生后逐渐稳定的反射
D.
出生后一段时间内可存在的病理反射
E.
出生后逐渐建立，终生存在的反射
【简答题】Mr Ding picked up a handbag lost by somebody when he was walking in the park. There was lots of cash, some bills of exchange and a set of commercial documents in the handbag. Mr Ding found, from the i...
【简答题】阅读理解。 Once there lived a very exact(精确的) man. One day when he was walking in the street, an old woman came over and asked him,' Excuse me, where is the nearest restaurant?' 'The nearest restaurant? Yo...
【简答题】出生后逐渐稳定的反射包括
【简答题】完形填空。 Billy is a boy of fif. His parents died three years ago. One day when he was walking in the street, he 1 a wallet. He returned it to the owner, Mr Baker. He gave his 2 to the boy. As the boy...
相关题目：
参考解析：
知识点：
题目纠错 0
发布
