男，7岁，右前臂肿痛20天，发病时皮温较高，体温达39℃。实验室检查：WBC：12.05×109/L，中性粒细胞79%。右尺桡骨正侧位DR片如图
最可能的诊断是（）
A.骨结核
B.溶骨型骨肉瘤
C.软骨肉瘤
D.骨纤维异常增殖症
E.化脓性骨髓炎
参考答案：E
解析：右桡骨远侧干骺端及骨干中下段大片状骨质破坏，形成病理骨折，骨干中上段可见较广泛骨膜反应，左前臂软组织肿胀，结合病史，可诊断为右桡骨急性化脓性骨髓炎并病理性骨折。急性化脓性骨髓炎早期与尤因肉瘤在临床和影像学表现很相似，应注意区别。本例软组织呈弥漫性肿胀，与尤因肉瘤的局限性软组织肿块不同。尤因肉瘤对放射线极为敏感，局部照射后，症状明显改善，骨破坏可见修复，常据此与其他疾病鉴别。
Third-generation mobile phones, known as 3G, are the next big step for the telecom industry. Data speed in 3G networks is much quicker than that in present technology. This means users can have high-speed Internet access and enjoy video and CD-quality music on their phones.
"Mobile data is not a dream; it’s not an option but a requirement," said Len Lauer, head of a US communications company, Sprint PCS, at a 3G conference in Bangkok earlier this month.
With 3G, you can forget about text messages telling you yesterday’s news; a 3G phone can receive video news programs, updated four times a day. Internet access will also be much quicker, making it easier to surf the Web on your phone than on your computer at home.
Don’t worry about getting lost. 3G phones offer map services so you can find a new restaurant just by pressing a few keys on your handset.
However, the most impressive part of 3G technology is video calling. With live two-way video communication, you can have face-to-face talks with friends and family on your mobile phone.
Many European countries have already launched the service. In May 2000 the US Government issued five license to run 3G wireless services, while the first 3G phones arrived in Italy in March this year.
International telecom companies can’t wait to sell 3G in China, the world’s largest mobile telecommunications market. But they will have to be patient. At the moment, China is busy testing its 3G-based technologies, networks and services. This will be followed by a trial period before the phones can finally hit the shops.
"We need to create a pool of 3G customers before the large-scale commercial launch of the service," said Fan Yunjun, marketing manager for Beijing Mobile. "We expect that the 3G licenses will be issued late next year.
| Third-generation mobile phones (3G mobile phones) | |
| (1) |
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| Impressive functions | a. Offer (6) services, helping you find your wayb. Provide two-way video (7) |
| 3G phones in China | a. China is busy (8) its 3G-based technologies, networks and services.b. 3G phones should go through a (9) period before being put into market.c. 3G phones are expected to be seen (10) next year. |
第（3）空应填（）