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【单选题】
The difference between a permutation and a combination isA.
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.
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举一反三
【简答题】二、用名词所有格简化下列句子中划线的部分。 1.I don ’ t know her name, but I can tell you what her husband is called . 2.He is fond of stories for children . 3.This is my room and that is occupied by my sister .
【简答题】Complete the following passage with words chosen from Text A. 课本第127页可见此题。 In his commencement address, Jobs tells us three stories from his life. The first story is about (1) the dots. Here “dots” re...
【单选题】（22c3?安徽）若某公司从五位大学毕业生甲、乙、丙、丁、戌中录用三人，这五人被录用的机会均等，则甲或乙被录用的概率为（ ）
A.
2 3
B.
2 5
C.
3 5
D.
9 10
【多选题】救护训练不同于技能训练,在进行现场救护训练时必须严密组织,做到
A.
确保训练所需的场地和器材装备
B.
严密组织，科学合理编组
C.
要干部带班参训
D.
高难度的操作应在医务人员的指导下进行
【简答题】成分偏析的原因是 。
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