设y=ln(a2+x2)，则dy=______
参考答案：
解析：[提示] 先求复合函数的导数，再求dy．
Some people often take ________ for granted ________ what is new is always better than what is old.
A．it; it
B．that; that
C．it; that
D．that; it
当启动一个Oracle实例时，初始化参数（）指出为数据文件信息保留的SGA空间的数量。
A.DB_FILES
B.DB_DATAFILES
C.DATABASE_FILES
D.LOG_FILES
