系统中存在下列反应:[img=176x25]1803a983fa65df8.png[/img];如果在一定温度下,向反应容器里加入相同物质的量的A和B,平衡时,一定是( )。
A: n(B)=n(C)
B: n(A)=n(B)
C: n(B)D: n(B)>n(A)
A: n(B)=n(C)
B: n(A)=n(B)
C: n(B)
举一反三
- 一定温度下,氧化还原反应平衡常数Kθ,取决于反应的( ) A: εθ B: ε C: nεθ D: nε
- 有一变量X~N(5,25),若[img=86x19]17e0aa2d6e02b9f.png[/img],则Y服从下列( )分布。 A: N(7.5,225) B: N(5,75) C: N(15,75) D: N(17.5,225)
- 若总体X~N(µ,σ2),则样本均值[img=18x22]17e441f6bc00e7e.png[/img]服从 A: N(μ,σ²/n) B: N(μ,σ²) C: N(μ/n,σ²) D: N(μ/n,σ²/n)
- 下列说法正确的是:Which options may be correct?(there are more than one correct answers) A: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)是O(h(n))【 if f(n) is O(g(n)),g(n) is O(h(n)),then f(n) is O(h(n))】 B: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)+g(n)是O(h(n))【if f(n) is O(g(n)),g(n) is O(h(n)),so f(n)+g(n) is O(h(n))】 C: 如果a>b>1,[img=41x23]180372b4386b7c1.png[/img]是[img=67x25]180372b44103fd1.png[/img],但[img=39x23]180372b449f3875.png[/img]不一定是[img=68x25]180372b453eacb6.png[/img]【if a>b>1,[img=41x23]180372b4386b7c1.png[/img] is [img=67x25]180372b44103fd1.png[/img], [img=39x23]180372b449f3875.png[/img] may not be [img=68x25]180372b453eacb6.png[/img]】 D: 函数f(n)是O(g(n)),当常数a足够大时,一定有函数g(n)是O(af(n))【if f(n)是O(g(n)),When constant a is big enough ,there must be g(n) is O(af(n))】
- 下列说法正确的是:Which options may be correct?(there are more than one correct answers) A: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)是O(h(n))【 if f(n) is O(g(n)),g(n) is O(h(n)),then f(n) is O(h(n))】 B: 如果函数f(n)是O(g(n)),g(n)是O(h(n)),那么f(n)+g(n)是O(h(n))【if f(n) is O(g(n)),g(n) is O(h(n)),so f(n)+g(n) is O(h(n))】 C: 如果a>b>1,[img=41x23]1802faed7067085.png[/img]是[img=67x25]1802faed78ce834.png[/img],但[img=39x23]1802faed807a0a4.png[/img]不一定是[img=68x25]1802faed88843cd.png[/img]【if a>b>1,[img=41x23]1802faed7067085.png[/img] is [img=67x25]1802faed78ce834.png[/img], [img=39x23]1802faed807a0a4.png[/img] may not be [img=68x25]1802faed88843cd.png[/img]】 D: 函数f(n)是O(g(n)),当常数a足够大时,一定有函数g(n)是O(af(n))【if f(n)是O(g(n)),When constant a is big enough ,there must be g(n) is O(af(n))】