设[*]，试问在点(0，0)处f(0，y)是否连续偏导数是否存在
参考答案：[*] 故f(x，y)在(0，0)处不连续． [*]
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---Putting on a happy face not only helps us make friends but also makes us feel better.
--- ________.
A．I’d love to.
B．I’m with you on that.
C．It’s up to you .
D．It’s my pleasure.
临床上80%的双相障碍患者被误诊或漏诊，最常见被误诊为哪两个疾病（）
A.精神分裂症
B.焦虑症
C.单相抑郁
D.睡眠障碍
