Give examples to show 'an ever more competitive childhood'.

听力原文：M1: Good morning. Can I help you?F1: Oh, yes. I wa...

未知题型听力原文：M1: Good morning. Can I help you?
F1: Oh, yes. I want to rent an apartment. My name is Kate Murphy.
M1: Is it K-A-T-E, M-U-R-P-H-Y.
F1: Yes, that's right.
M1: Then what kind of apartment do you prefer?
F1: Well, I want to live near Sunny Street.
M1: Sunny Street, right. Anything else?
F1: The rent should not be more than 120 pounds a month, including water and gas. I'd like an air conditioner and heating system.
M1: How long are you going to rent it?
F1: About a year and a half, from February.
M1: Do you have the contact number?
F1: It's 55322788.
M1: OK! As soon as I find an apartment I will call you.
F1: Thank you. I'm looking forward to your answer.
?Look at the note below.
?You will hear a call to rent an apartment.
Hiring Registration
Date: 5th Jan.
Time: 10:30
Name of the customer: Kate (5)
Contact No: (6)
Service Details:
1 An apartment near (7) street, with air-conditioner and heating system.
2 Rent: net more than (8) a month, including water and gas.
3 Renting Period: about 1.5 years from February.

当没有固定材料时可以利用伤员健肢进行骨折临时固定。()

判断题当没有固定材料时可以利用伤员健肢进行骨折临时固定。( )

甲公司持有A、B两种股票组成的证券投资组合，A、B的比重分别为40%和60%，其β系数分别为2.0和0.5，A...

未知题型甲公司持有A、B两种股票组成的证券投资组合，A、B的比重分别为40%和60%，其β系数分别为2.0和0.5，A股票收益率的标准差为20%，市场组合的风险收益率为 14%，无风险收益率为4%，市场组合收益率的标准差为8%。
要求计算以下指标：
(1) 甲公司证券组合的β系数；
(2) 甲公司证券组合的风险收益率；
(3) 甲公司证券组合的必要投资收益率；
(4) A股票与市场组合收益率的协方差；
(5) 计算A股票与市场组合的相关系数。