设
z≠0在x=0处连续，则a=______。
参考答案：
解析：[详解] [*] 因为f(x)在x=0处连续，所以[*]
On seeing Mr. Lee ______ him, she fled and slammed the door behind him.
A．to walk
B．having walked
C．walk
D．walked
组织策略的常用方法有哪些？
z≠0在x=0处连续，则a=______。
z≠0在x=0处连续，则a=______。