在进行临边作业时设置的安全防护设施主要为()。 A.安全带 B.防护栏杆 C

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问题:

在进行临边作业时设置的安全防护设施主要为()。

A.安全带

B.防护栏杆

C.安全网

D.安全帽

考点:登高架设作业操作证高处作业基础知识高处作业基础知识题库
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简述中国古代文论的民族特色。

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EBV常与下列哪些肿瘤的发生有关()

A.食管癌 

B.肺癌 

C.鼻咽癌 

D.甲状腺癌 

E.Burkitt淋巴瘤 

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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)
  • a. Data speed: (2) than present technology
  • b. Video and (3) music
  • c. Video news programs: (4) four times a day
  • d. Internet access: quicker and (5)
Impressive

functions

a. Offer (6) services, helping you find your wayb. Provide two-way video (7)
3G phones in Chinaa. 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(2)空应填()

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用刀口尺检定游标卡尺工作面的平面度时,在一对角线位上出现两边有1μm间隙量,而在另一对角线方位上出现中间有2μm的间隙。试求该平面的平面度。

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一般来说,活动者觉知被评价的程度越高,其动机水平就越高。 ( )

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