设z=f(2x-y,ysinx),其中_厂具有连续的二阶偏导数,求
参考答案:令u=2x-y,v=ysinx,则z=f(u,v), [*]
解析:[考点提示] 隐函数的二阶偏导数.
I knew then that Amy and I would be _____ and my first year of college would be a success. [ ]
A. sisters
B. friends
C. students
D. fellows
对燃气设备检漏时,只能使用肥皂水类物质,绝对禁止使用明火试验。( )