题目内容

以下哪个选项是真的?()

A. PCA明确地尝试对数据类别之间的差异进行建模,而LDA没有
B. 两者都试图模拟数据类之间的差异
C. LDA明确地尝试对数据类别之间的差异进行建模,而PCA没有
D. 两者都不试图模拟数据类之间的差异

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简述机器学习PCA和LDA数据降维方法的优缺点

If a lathe is dirty, its ____________________ may need to be cleaned.

A. cover
B. guide rails
C. spindles
D. both B and C

We can spray ______________in order to eliminate the old grease and oil residue.

A. water
B. anti-corrosion solution
C. Detergent
D. washing-up liquid

We can’t use _________to remove the dried bits of dirt and old grease.

A. cleaning paper
B. toothbrush
C. polishing paste
D. nail file

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