选择题：__ Northwestern Airlines. May I help you?( )— ____

题目内容：
__ Northwestern Airlines. May I help you?( )
— _____ .(本题2.0分)
A、 Yes, I’d like some information about morning flights from Beijing to Detroit
B、 Yes, I’d like to have two pints of beer, please
C、 Well, there’s flight at 11:00 am. It’s a nonstop flight
D、 Well, all the seats have been reserved
参考答案：

函数f(x,y)={2xy/x,在点（0,0）处（）（A）连续且偏导存在 （B）不连续且不存在偏导（

函数f(x,y)={2xy/x,在点（0,0）处（）（A）连续且偏导存在 （B）不连续且不存在偏导（C）连续但不存在偏导 （D）偏导存在但不连续

分类：许昌学院-小学教育(专升本)-大学英语4  题型：选择题
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