【单选题】The difference between a permutation and a combination is:
A.
in a permutation order is important and in a combination order is not important.
B.
in a permutation order is not important and in a combination it is important.
C.
a combination is based on the classical definition of probability.
D.
a permutation is based on the classical definition of probability.
【判断题】Combination skin is not oily except for the T zone.
【单选题】The difference between a permutation and a combination is
A.
a combination is based on the classical definition of probability.
B.
in a permutation order is not important and in a combination it is important.
C.
in a permutation order is important and in a combination order is not important.
D.
a permutation is based on the classical definition of probability.
【判断题】The sound /tʃ/ is often spelled with letter combination "ch".
【判断题】“甘捨神奇以就臭腐”中的“神奇”指的医术,“臭腐”指的是庸医。
【简答题】从化学结构上看,糖类是()或(),或者()后可以生成多羟基醛或多羟基酮的化合物。