某5层教学楼，每层布置如下（1～5层）：2个大教室Ps11=2×2kW；8个小教室Ps2=8×1kW；教师休息室Ps3=2kW；卫生间2个Ps4=2×100W；大厅、走廊Ps5=500W；电源电压为380V／220V；计算推荐需用系数KX取0．8，统计教学楼负荷量Pjs。

在采用EPC-400控制器的FOPX型分油机自动控制系统中，（）。
①压力开关PS2用来监视净油出口压力
②压力开关PS2应当在分油机排渣时打开
③PS2是排渣口是否打开的反馈信号
④PS2是监视分油机本身故障的开关
⑤EPC-400型控制器发出排渣信号后未接收到PS2闭合的信号，说明分油机不能排渣

A:①③④ B:①②④ C:③④⑤ D:③⑤

某UE已有PS1业务，其上行承载在DCH上，且速率为128K；接着发起PS2业务，RBC算法为其上行选择E-DCH信道。此时RBC为并发业务确定的目标信道为：原业务信道不变、新业务上行选择E-DCH信道。

改变bash的提示符实际上就是改变变量（）。

A:$HOME B:$PWD C:$PS1 D:$PS2

阿尔茨海默病有关遗传学研究的描述中，目前支持最多的是（）。

A:是一种常染色体显性遗传病 B:可能是一种常染色体隐性遗传病 C:可能与APP基因有关 D:可能与PS基因有关 E:可能与APP基因、PS1基因及PS2基因均有关

关于阿尔茨海默病的病因机制，遗传学普遍认同的因素是

A:是一种性染色体隐性遗传病 B:是一种常染色体隐性遗传病 C:与APP基因有关 D:与PS1基因PS2基因有关 E:可能与APP、PS1及PS2等基因均有关

[A] THINGS have not been going well for Sony lately. Last month senior executives at the Japanese electronics giant issued an unprecedented apology after discovering that 9.6m laptop batteries, supplied to other computer-makers, were faulty and would have to be recalled at a cost of $436m. Sony’s Blue-ray high-definition technology, launched this summer, has suffered from delays and component shortages. "They really need some good news," says Paul Jackson of Forrester, a consultancy. [B] In gaming, Sony faces far stronger competition than it did when it launched the PlayStation 2 in 2000. The PS2 went on to sell over 100m units, giving Sony 70% of the market. But gaming is a cyclical business, and success in one round does not guarantee success in the next. Microsoft has already sold over 6m of its Xbox 360 consoles, launched a year ago, and expects to have sold 10m by the end of 2006. Manufacturing problems delayed the PS3’s launch from May and meant that only 93000 consoles were available for the Japanese launch, Sony hopes to sell 2m by the end of the year, but even if it does so, it will start the race in third place. [C] Yet it will be some time before it is possible to tell whether the PS3 can rescue Sony. Beneath the short-term troubles, the company is playing a long game. Sony is betting that the PS3’s advanced technology will sustain the company for a decade by extending the PlayStation franchise beyond gaming. [D] Finally, the PS3 is a litmus test for Sir Howard’s turnaround effort, one of the aims of which is to get Sony’s various divisions to co-operate more fully. Sony has improved margins in its electronics business and reduced headcount by 10 000 ahead of schedule. Sir Howard even suggested this week that the battery fiasco had helped by making it easier for him to convince doubters within Sony of the need to change. [E] Sony needs the PS3 to succeed for three reasons: to maintain its lucrative dominance of the games industry; to seed the market for Blue-ray and establish Sony in the emerging market for internet video downloads; and to demonstrate that the turnaround being led by Howard Stringer, who took over as chief executive in 2005, is working and that Sony’s gaming, electronics and content divisions really can work together. Despite the enthusiasm of the PS3’s early buyers, success in each of these areas is far from assured. [F] American regulators began investigating the company last month as part of an inquiry into allegations of price-fixing in the memory-chip market. And having brag been the world’s most valuable electronics firm by stockmarket value, Sony’s market capitalisation has fallen to less than half that of Samsung, its South Korean rival. [G] So a lot is riding on the PlayStation 3 (PS3), the latest incarnation of Sony’s industry-leading games console, which was launched with much fanfare in Japan on November 11th. At the Yurakucho flagship store of Bic Camera, one of Japan’s largest electronics retailers, hundreds of garners queued through a cold night. Ken Kutaragi, who runs Sony’s gaming division, was there to welcome them in the morning. [H] The PS3 is also meant to ensure that Blue-ray triumphs over HD-DVD as the high-definition successor to the DVD video format. The idea is that millions of PS3s bought by garners will seed the market for Blue-ray, providing it with critical mass and ensuring that Hollywood studios, which are reluctant to back two rival standards, plump for Blue-ray over HD-DVD. But instead of riding the PS3 as a Trojan horse, Blue-ray has instead hobbled it by increasing its price and delaying its introduction. [I] So a few teething problems in the early days are nothing to worry about; besides, the PS2 was also criticised for being expensive, over-engineered and unreliable when it first appeared. But having achieved 70% market share last time around, Sony is certain to lose ground this time. The only question is how much. （44）（）

在某分布式数据库系统中，设某数据表的模式为S(a1， a2， a3， a4， a5)，其中a1为主码，该表中数据量大，a2取值空间为1，2，3。设有两个数据分片方案，分别为PSz1＝S11， S12， S13和PS2＝S21， S22， S23，任取分片S1i，S1i的模式为(al， a2， a3， a4， a5) ，且S1i中的任一元组t都属于S，且t在属性a2上的取值为i。任取分片S2i，有S2i与S元组数相同，且其主码为al，S21的模式为(al， a2)，S22为(a1， a3， a4)，S23为(al， a5)。则关于PS1和PS2的分片机制，下列说法正确的是（）
 

A:PS1为水平分片，PS2为垂直分片 B:PS1为垂直分片，PS2为导出分片 C:PS1为水平分片，PS2为导出分片 D:PS1为垂直分片，PS2为水平分片

在某分布式数据库系统中，设某数据表的模式为S（al，a2，a3，a4，a5），其中al为主码，该表中数据量大，a2取值空间为{1，2，3}。设有两个数据分片方案，分别为PSz1＝{S11，S12，S13}和PS2＝{S21，S22，S23}，任取分片S1i，S1i的模式为（al，a2，a3，a4，a5），且S1i中的任一元组t都属于S，且t在属性a2上的取值为i。任取分片S2i，有S2i与S元组数相同，且其主码为al，S21的模式为（al，a2），S22为（a1，a3，a4），S23为（al，a5）。则关于PS1和PS2的分片机制，下列说法正确的是（）

A:PS1为水平分片，PS2为垂直分片 B:PS1为垂直分片，PS2为导出分片 C:PS1为水平分片，PS2为导出分片 D:PS1为垂直分片，PS2为水平分片