已知，则tan2α=（）。

在Windows操作系统中，下列关于应用程序窗口的描述，不正确的是( )。

A．一个应用程序窗口可含多个文档窗口
B．一个应用程序窗口与多个应用程序相对应
C．应用程序窗口最小化后，其对应的程序仍占用系统资源
D．应用程序窗口关闭后，其对应的程序结束运行

缺词填空。 根据短文内容及首字母提示，补全空格内单词，使短文完整、通顺。

     Have you ever wanted to find a new world, make new friends and have an adventure? Well, (1) f_______

Alice to Wonderland and you'll find everything you need.

     Alice in Wonderland, a new Disney movie, opened in Chinese cinemas on March 26. It's based on English

writer Lewis Carroll's beloved 1865 story Alice's Adventures in Wonderland.

     In the movie, Alice grows up. She is 19 years old. One day, she goes to a party and learns that a rich man

wants to (2) m_______ her. She doesn't like him, so she follows the White Rabbit and (3) r_______ away.

She falls (4) i_______ a deep hole and arrives at Wonderland, a place she (5) v_______ many years before.

    Alice has no idea why she is in Wonderland. She can't (6)r_______ anything about her last visit. The

White Rabbit tells her that Wonderland is (7) u_______ control of the evil (邪恶的) Red Queen. And Alice is

the (8) o_______ one who can save Wonderland!

    Will Alice be (9) a_______ to do it? Go to the (10) t_______ and see the movie. The new movie mixes live

action and 3D technology to create beautiful and exciting scenes. What's more, you will go on an adventure

of self-discovery with Alice and her Wonderland friends.

中国人民银行宣布，为加强流动性管理，适度调控货币信贷投放，决定上调存款类金融机构人民币存款准备金率0．5个百分点。央行上调存款准备金率将   

①增加货币储量，提高人民收入

②降低物价，保障商品供给

③努力使流动性供给和银行体系流动性保持合理

④有利于防止通胀

A．①②

B．①③

C．②④

D．③④

产品在任一随机时刻需要或开始执行任务时，处于可工作状态或使用状态的程度称之为（）。

A.产品可靠性

B.产品稳定性

C.产品可用性

D.产品适用性

系统接通率指每小时系统应答量占系统请求总量的比例（包括10011和10010）。计算方法：系统应答总量÷系统请求总量，合规值≥98%