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问答题

试证函数f（z）=e^x（xcosy-ysiny）+ie^x（ycosy+xsiny）在z平面上解析。

单项选择题

How should "field call" in the forth sentence analyzed be understood?

A．receiving the call that is given to anyone
B．receiving the unexpected call from anxious parents
C．receiving the timely call when in need
D．receiving the call from the subburb