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【单选题】
随机变量 ξ~P(25),现将 ξ标准化后得到随机变量 η,以下关于 η的描述中正确的是( )。A.
η ~P(1)
B.
η ~N(0,1)
C.
η =( ξ -5)/25
D.
η =( ξ -25)/5
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皮皮学刷刷变学霸
举一反三
【单选题】Where did the conversation take place?
A.
At the bank.
B.
In the restaurant.
C.
At the post office.
【简答题】一粉红色固体的实验式为CoCl3·5NH3·H2O,其溶液也呈粉红色,用AgNO3溶液滴定时迅速生成3 mol AgCl沉淀。粉红色固体受热失去1 mol H2O,生成紫色固体,其中NH3:Cl:Co的比例不变。紫色固体溶解后,其溶液的摩尔电导值比粉红色溶液小,试推断粉红色和紫色两个八面体配合物的结构,并分别给以命名。
【单选题】MHC 限制性表现在
A.
巨噬细胞的吞噬作用
B.
ADCC 作用
C.
Tc 细胞识别靶细胞抗原的过程
D.
B 细胞识别 T1 抗原的过程
E.
补体依赖的细胞毒作用
【单选题】Where did the conversation take place?
A.
At the bank.
B.
In the restaurant.
C.
At the post offic
【单选题】Only when______ can the postal code system achieve its full efficiency.
A.
all the post offices in the country have the fight machines
B.
all the post offices have trained staff
C.
most post offices have the right machines
D.
most post offices have trained staff
【单选题】—Excuse me, could you tell me where I can post a letter? —_________. Turn left. There is a post office on the Fifth Road. [ ]
A.
Sure
B.
Sorry
C.
Sounds nice
D.
Good idea
【单选题】— Excuse me, can you tell me where the nearest bank is, please? — _____ Oh yes! It's past the post office, next to a big market. [ ]
A.
Mm, let me think.
B.
Oh, I beg your pardon?
C.
You're welcome.
D.
What do you mean?
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