根据动作对环境的依赖程度不同．可将操作技能分为闭合性操作技能与（）操作技能。

2012年9月25日，我国首艘航空母舰“辽宁号”正式交接入列，航母使用滑跃式起飞甲板，2012年11月23日，我军飞行员驾驶国产歼-15舰载机首次成功起降航空母舰，假设歼-15战斗机在航母上起飞的情况可以简化成如下模型．航空母舰上的起飞跑道由长度为l₁的水平跑道和长度为l₂=32m的倾斜跑道两部分组成．水平跑道与倾斜跑道末端的高度差h=4.0m．一架质量为v=at₁=2.0×10⁴kg的飞机，其喷气发动机的推力大小恒为t₂=t-t₁=0.5=1.2×10⁵N，方向与速度方向相同，为了使飞机在倾斜跑道的末端达到起飞速度61m/s，外界还需要在整个水平轨道对飞机施加助推力F_推=1.4×10⁵N．假设航母处于静止状态，飞机质量视为不变并可看成质点，飞机在整个运动过程中受到的平均阻力大小恒为飞机重力的k倍（k=0.1，g=10m/s²．）

求：（1）歼-15在水平跑道末端的速度大小；

（2）水平跑道l₁的长度至少为多少（保留三位有效数字）．

请阅读下列应用文及其相关信息,  并按照要求匹配信息。

        阅读下列图书馆各个区域的相关信息：

     A. Bing Wing Carrels

     Study desks with a lockable storage compartment are located on the third floor of the Bing Wing of

Green Library. Graduate students and visiting scholars are given priority for carrel assignments.

Undergraduate students, if assigned, may use a carrel for one quarter at a time.

     B. The Velma Denning Room

     The Velma Denning Room provides a focused environment for the data and software services

offered by Social Science Data and Software (SSDS).

     SSDS provides access to an extensive collection of datasets from consortia, foreign governments,

international organizations and US agencies and offices on CD ROM and diskette. Users can view,

download, or transfer numeric data on CD ROM and diskette from computer workstations.

     C. Bender Room

     The Albert M. Bender Room, with its wonderful views of the quad and the hills beyond the campus,

offers comfortable seating and a quiet atmosphere for study, leisure reading, and reflection. The Bender

Room contains a collection of good books of current and classic interest in fiction and nonfiction. This

collection has been made possible by a generous gift from the Stanford University Bookstore.

     D. Lane Reading Room

     The Lane Reading Room, houses the Humanities and Area Studies Resource Center. From the

beginning, the room has served as a reading room, first for general purposes, and later for the study of

rare books and manuscripts(手稿). Traditional study and reading space is now complemented by

Internet access (available from all seating in the room) and computer workstations. The Lane Reading

Room houses the Humanities Digital Information Service (formerly the Academic Text Service), which

provides access to SUL/AIR's electronic library of humanities texts as well as to electronic indexes,

publications, and the Internet.

     E. Dissertation(专题论文) Rooms

     Dissertation Rooms are available to currently registered doctoral students. Priority is given to those

students in the Humanities and Social Sciences who use the Green Library collections. Because the

rooms are in high demand, all rooms are doubleassigned and are available only to students who are

both currently registered and advanced to candidacy.

     F. Jonsson Social Sciences Reading Room

     The Jonsson Social Sciences Reading Room is designed to facilitate a range of social science

learning and research activities. A social science reference collection of over 15,000 volumes as well as

classic texts, new and notable publications, and current issues of core journals in the social sciences are

available. The Jonsson Reading Room is also home to the Social Sciences Resource Center computer

cluster.

以下是人物信息,  为每个人选择相应的区域：

1. Lisa intends to go into studies on social science, and she is considering which specific question should

be focused on. Rather than getting easy access to electronic texts, she would like to take a quick look

at the new publications in the printed form first.

2. Ali is on a visit to the university. He has been invited to stay on campus for 2 weeks. At the library,

he may need a place that can be locked up to keep his belongings.

3. Jack has finished his project on humanities. For several months he was seated in front of the

computer screen writing his dissertation. Today he wants a change. A comfortable place with interesting

novels, short stories, or even fairy tales is most favorable.

4. Ann, with a master's degree on social science, is one of the currently registered doctoral students. Her

supervisor has asked her to search for some information in the SUL/AIR's electronic library. This is an

urgent task.

5. Nick is doing a research on the Middle East. He badly needs a wide range of datasets from the area.

He also plans to store the data on CD ROM so that he can use them later.

“5·12”大地震之后，我们班转来一位来自灾区的孤儿，他将成为你的同学，你会怎样劝慰他：

下列选项中，属于建设工程项目进度控制的技术措施的是（）。

A．工程风险分析

B．资金需求计划

C．进度控制工作管理职能分工

D．选用对实现进度目标有利的施工方案

白喉病人隔离需隔离至临床症状消失、咽拭子（）次细菌培养阴性后方可出院。

A、1

B、2

C、3

D、4