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两个变量(x，y)，有n对观测值(xi，yi)，如果这n个点在直角坐标系中形成一条直线，则相关系数，的取值为（）。

A. r=1
B. r=0
C. r=-1
D. r>0
E. 不能确定

当板件厚度或宽度在一侧相差大于4mm时，应做坡度不大于1：2.5(静载)或_________ (动载)的斜角，以平缓过度，减小应力集中

A customer has two locations that host their pSeries servers. Traffic is being routed through the public Internet. The customer needs to exchange confidential financial data between the servers. Which of the following solutions should the pSeries technical specialist propose to the customer to secure the data？（）

A DCE domain
B. A Kerberos domain
C. A PPP tunnel between the servers
D. An IPSEC tunnel between the server

王先生年收入为15万元,每年的储蓄比率为40%,目前有存款2万元,打算5年后买房。假设王先生的投资报酬率为15%。王先生买房时准备贷款20年,假设房贷利率为6%。王先生可负担的房屋总价为()万元。

A. 113.30
B. 91.9
C. 82.1
D. 79.8