曲线y=ln x与盲线x+y=1垂直的切线方程为__________.
可导函数f(x),对任意的x,y恒有f(x+y)=f(x)f(y),且f"(0)=1,则f(x)等于( )
A. x+cosx.
B. shx.
C. ex.
D. 1一e—x.
设F(x)=g(x)φ(x),x=a是φ(x)的跳跃间断点,g"(a)存在,则g(0)=0,g"(a)=0是F(x)在x=a处可导的( )
A. 充分必要条件.
B. 充分非必要条件.
C. 必要非充分条件.
D. 非充分非必要条件.
Many aphasics do not show total language loss. Rather, different aspects of language are impaired. Aphasics in ______ area reveal word-finding difficulties and problems with syntax.
A. Werniker’s
B. visual
C. motor
D. Broca’s