可变成本是指随着产量变动而变动的那部分，下列属于可变成本的有( )。A．原材料 B

在骨折急救中错误的是

A．可疑骨折按骨折处理

B．现场不复位，仅超关节固定

C．骨外露时须复位，并包扎伤口

D．脊柱骨折用平托法或滚动法，移至木板搬运

E．畸形明显可能穿破皮肤、损伤血管神经时可简易复位、固定

CDFI检测输尿管膀胱开口处结石的特点（）①输尿管膀胱开口喷尿频率减少②输尿管膀胱开口喷尿尿流变短③输尿管膀胱开口喷尿消失④输尿管膀胱开口喷尿频率增多⑤输尿管膀胱开口喷尿尿流变粗

A.①②③

B.④⑤

C.③

D.②③

E.③④⑤

西方注册会计师审计之所以起源于16世纪初意大利的合伙企业制度，最根本的原因是在这一时期的意大利( )

A．合伙企业应运而生

B．合伙企业的所有权与经营权开始分离

C．人们开始聘请会计专家担任查账和公正工作

D．人与人之间企业导致了股份有限制企业的产生

求助者：我已尝试同我父亲和谐相处，但的确行不通，他对我太严厉了。以下( )的共情做得最好。

A．咨询师1：你应该努力去理解他的观点
B．咨询师2：你尝试与父亲相处，但又不成功，因而感到沮丧
C．咨询师3：你似乎无法接近父亲，所以感到沮丧。你想让他对你宽容些
D．咨询师4：似乎表明你与你父亲的关系正处在困难时期

Crash-Prone The Solution Could Be Windows XP;
But does It Make Sense to Upgrade Your Operating System

You can hardly turn on the television or click on a Web page without seeing a colorful ad for Microsoft’s new Windows XP operating system, which launched on Oct. 25.
So, now that the long-awaited XP is here, what are you going to do about it Should you upgrade, and if you do, how hard is it and what are the potential drawbacks The decision is pretty easy if you really need a whole new Windows PC. They all come with XP preloaded, and in my tests of a few such models, they seemed to work well. I’m writing this on my own new personal computer, a Dell that came preloaded with Windows XP, and it worked great right out of the box.
The only downside is that if you’re keeping older printers, scanners and other peripherals, you may have to download new "drivers" — the small programs that allow a PC and a peripheral to interact. XP contains many of the drivers for recent-model printers and the like, sparing you from even digging out the disks that came with them. But if you have older equipment, you may have to download new drivers, because the original software that came with the hardware might not work with Windows XP.
It’s harder to decide what to do about XP if you have a PC that doesn’t need replacing. If you’re happy with the way things are working, don’t upgrade. It’s never a trivial thing to change operating systems, and you shouldn’t do it without a reason.
However, there are two big limitations in prior versions of Windows that XP does fix, and that might make an upgrade worthwhile. These are stability — that is, the ability not to crash, or at least to do so rarely — and compatibility. Windows 98 and Windows ME, the previous consumer versions, had wide compatibility with consumer software and peripherals, but lousy stability. Windows 2000, the prior business version, had great stability, but limited compatibility with consumer software and add-on hardware.
Windows XP is designed to combine the stability of Windows 2000 (with which it shares underlying code) with the compatibility of Windows 98 and Windows ME, and in my experience, it does a good job at that. So if you need more reliability or compatibility than your current version of Windows supplies, an upgrade may be in order.
But there’s a catch. Microsoft says that an XP upgrade will really be sensible only if your PC is two years old or less — built after 1999. And you need at least a 300MHz processor and 128 megabytes of memory, though I recommend at least 192MB, and 256MB is even better. Also, you’ll need a roomy hard disk — Windows XP alone will suck up 1.5 gigabytes.
So there are only a limited number of PCs for which upgrading makes sense, and you may have to invest in beefing yours up first.
Not only that, but you must have Windows 98, Windows ME or Windows 2000 on your current system to upgrade. If you have Windows 95 and somehow still have a new enough machine to qualify, you have to buy a very expensive, "full" version of Windows XP, basically wipe out your whole hard disk and start from scratch with XP, losing all your installed programs and settings.
If you’re good to go, you next have to decide which upgrade version of XP is right for you — the $99 Home Edition or the $199 Professional. The differences between them are surprisingly small, and 95 percent of home and small-business users will be fine with the home version. Buy the pro version only if you are running more than a modest network or need special security features.
Note that if you have Windows 2000, or NT 4.0, you can upgrade only to Windows XP Professional, not the Home Edition. If you have Windows 98 or ME, you can choose either flavor of XP.
In my tests, which included five PCs running all the main older versions; the Windows XP upgrades, both home and pro, went very smoothly.
The process took about an hour in each case, and the installation software was friendly and clear in its instructions and progress reports.

The writer wrote the article on a computer ______.
A. that often crashes
B. that needs replacing
C. preloaded with Windows XP
D. limited in stability and compatibility