皮皮学，免费搜题
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【多选题】
特征选择的要求是 ()A.
类内方差大
B.
类间距离大
C.
类内方差小
D.
类间距离小
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】I don ’ t know what you (talk)______ about.
【简答题】1 don-t know what should I do with these books．（改为简单句） I don-t know what_________ _________with these books．
【简答题】What is the meaning that I really don ’ t know what to say at this moment?
【单选题】I ’ ll start the work _______he comes. I don ’ t know what to do first.
A.
after
B.
before
【单选题】I don ’ t know what ______ when i finish school. My brother ______ university in Sep. , but I don ’ t like studying.
A.
will do, will start
B.
am going to do, is starting
C.
am going to do, will start
D.
will do, is going to start
【简答题】When you make a mistake, big or small, cherish (珍视) it like it’s the most precious thing in the world, because in some ways, it is. Most of us feel bad when we make mistakes, beat ourselves up about i...
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