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【单选题】
在 25 °C、 101.3kPa 下,将 KClO 3 加热分解,用排水集气法收集 O 2 ,得到 250mL 气体,则 n (O 2 ) ( )。A.
大于 1.02 × 10 -2 mol ；
B.
等于 1.02 × 10 -2 mol
C.
小于 1.02 × 10 -2 mol
D.
等于 10.2mol 。
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【多选题】How to choose the optimal value for K?
A.
Cross-validation can be used to determine a good value by using an independent dataset to validate the K values.
B.
Low values for K (like k=1 or k=2) can be noisy and subject to the effect of outliers.
C.
A large k value can reduce the overall noise so the value for 'k' can be as big as possible.
D.
Historically, the optimal K for most datasets has been between 3-10.
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