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【简答题】
设X是集合，若对任意的x，y∈X，都存在一个实数与它们相对应，记作ρ(x，y)，并且满足下列条件(称为距离公理)： (1)非负性ρ(x，y)≥0，且ρ(x，y)=0 ； (2)对称性ρ(x，y)=ρ(y，x)； (3)三角不等式ρ(x，y)≤ρ(x，z)+ρ(z，y)则称ρ(x，y)为x与y之间的距离，并称定义了距离的集合X为距离空间或度量空间，证明：n维Euclid空间R n ，连续函数空间C([a，b])与P数列空间都是距离空间
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举一反三
【单选题】 Twelve ____ were hurt, but no ___ were lost in that accident.
A.
person, life
B.
people, lives
C.
peoples, lives
【单选题】Twelve ____ were hurt, but no _____ were lost in that accident.
A.
person, life
B.
peoples, lives
C.
people, lives
【单选题】Twelve were hurt, but no were lost in that accident.
A.
person, life
B.
peoples, lives
C.
people, lives
D.
persons, life
【单选题】Twelve were hurt, but no were lost in that accident.
A.
person, life
B.
. people, lives
C.
peoples, lives
D.
. persons, life
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