水痘愈后可见:()
A.脱屑
B.色素沉着
C.瘢痕
D.蜕皮
E.以上均无
参考答案:E
A Web ______ is one of many software applications that function as the interface between a user and the Internet.
A.display
B.browser
C.window
D.view
设函y=y(x)是由方程ln(x+y)=x2y所确定的隐函数,求函数曲y=y(x)过点(0,1)的切线方程.