小儿肺炎出现发绀时，其检查结果，何种最可能出现（）

A:SaO<85％，还原Hb<5g／dl B:SaO>85％，还原Hb>5g／dl C:SaO<85％，还原Hb>5g／d1 D:SaO>85％，还原Hb<5g／dl

长丝三站连续纺硫酸钠控制范围是（）。

A:250±5g/l B:270±6g/l C:240±5g/l D:270±5g/l

[ With the 4G telecommunications systems now starting to be deployed, people are looking towards the development of 5th generation or 5G technology services. Although the deployment of any wireless or cellular system take many years, development of the 5G technology systems is being investigated. The new 5G technologies will need to be chosen developed and perfected to enable timely and reliable deployment. The new 5th generation,5G technology for cellular systems will probably start to come to fruition around 2020. The current status of the 5G technology for cellular systems is very much in the early development stages. Many companies are looking into the technologies that could be used to become part of the system. In addition to this, a numberof universities have set up 5G research units focused on developing the technologies for 5G. In addition, the standards bodies, particularly 3GPP are aware of the development but are not actively planing the 5G systems yet. Many of the technologies to be used for 5G will start to appear in the systems used for 4G and then as the new 5G cellular system starts to formulate in a more concrete manner, they will be incorporated into the new 5G cellular system. The major issue with 5G technology is that there is such an enormously wide variation in the requirements：super fast downloads to small data requirements for IoT than any one system will not be able to meet these needs. Accordingly a layer approach is likely to be adopted. As one commentator stated：5G is not just a mobile technology. It is ubiquitous access to high & low data rate services.]

Based on the paragraph above, at present, 5G technology for cellular systems( )

A:has matured B:has setup its standards C:is very much in the early development stages D:is in use

[ With the 4G telecommunications systems now starting to be deployed, people are looking towards the development of 5th generation or 5G technology services. Although the deployment of any wireless or cellular system take many years, development of the 5G technology systems is being investigated. The new 5G technologies will need to be chosen developed and perfected to enable timely and reliable deployment. The new 5th generation,5G technology for cellular systems will probably start to come to fruition around 2020. The current status of the 5G technology for cellular systems is very much in the early development stages. Many companies are looking into the technologies that could be used to become part of the system. In addition to this, a numberof universities have set up 5G research units focused on developing the technologies for 5G. In addition, the standards bodies, particularly 3GPP are aware of the development but are not actively planing the 5G systems yet. Many of the technologies to be used for 5G will start to appear in the systems used for 4G and then as the new 5G cellular system starts to formulate in a more concrete manner, they will be incorporated into the new 5G cellular system. The major issue with 5G technology is that there is such an enormously wide variation in the requirements：super fast downloads to small data requirements for IoT than any one system will not be able to meet these needs. Accordingly a layer approach is likely to be adopted. As one commentator stated：5G is not just a mobile technology. It is ubiquitous access to high & low data rate services.]

many of the technologies to be used for 5G ( ) in the systems used for 4G

A:is being developed B:already appeared C:will not appear D:will start to appear

[ With the 4G telecommunications systems now starting to be deployed, people are looking towards the development of 5th generation or 5G technology services. Although the deployment of any wireless or cellular system take many years, development of the 5G technology systems is being investigated. The new 5G technologies will need to be chosen developed and perfected to enable timely and reliable deployment. The new 5th generation,5G technology for cellular systems will probably start to come to fruition around 2020. The current status of the 5G technology for cellular systems is very much in the early development stages. Many companies are looking into the technologies that could be used to become part of the system. In addition to this, a numberof universities have set up 5G research units focused on developing the technologies for 5G. In addition, the standards bodies, particularly 3GPP are aware of the development but are not actively planing the 5G systems yet. Many of the technologies to be used for 5G will start to appear in the systems used for 4G and then as the new 5G cellular system starts to formulate in a more concrete manner, they will be incorporated into the new 5G cellular system. The major issue with 5G technology is that there is such an enormously wide variation in the requirements：super fast downloads to small data requirements for IoT than any one system will not be able to meet these needs. Accordingly a layer approach is likely to be adopted. As one commentator stated：5G is not just a mobile technology. It is ubiquitous access to high & low data rate services.]

the major issue facing with 5G technology is( ).

A:super fast downloads B:small data requirements for IoT C:4G system has already satisfied these needs D:an enormously wide variation in the requirements

下面属于5G的RAN高频产品的有（）

A:AAUA9801 B:AAUA9815 C:AAUA9631 D:AAUA9611

5G和MM产品类似，实验网选址应尽量周围环境开阔 的站点。

欲称出约39g物品的质量，应顺次往天平的右盘中添加的砝码是（ 　 ）

A:30g、9g　 　 B:30g、5g、4g　　 C:20g、10g、5g、2g、2g　　 D:20g、10g、5g、4g

欲称出约39g物品的质量，应顺次往天平的右盘中添加的砝码是:

A:30g、9g;　　 B:30g、5g、4g;　　 C:20g、10g、5g、2g、2g;　　 D:20g、10g、5g、4g.

镁在空气中燃烧，下列说法符合质量守恒的是

A:4g镁和1g氧气发生反应生成5g氧化镁 B:3g镁和2g氧气反应生成5g氧化镁 C:2.5g镁与2.5氧气反应生成5g氧化镁 D:2g镁和3g氧气反应生成5g氧化镁