麻烦各位大大帮忙解答几个问题~~！！很急，在线等！
1.why do we need to evaluate the usability of user interface design?2.what do you understand or mean by "mashup"?
3.what are the suitable objectives for conducting the usability evaluation of the studied mashup tools?
以上3个问题需要各位大大帮忙解答一下~~非常感谢！ 你是广东轻工职业技术学院的吗。我也是
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