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Test for COVID-19 Direction: Listen to a passage about COVID-19 and judge the following questions true or false. And mark T for True or F for False. ( ) 1. Scientists are not sure yet about how deadly the new coronavirus is. ( ) 2. Healthy officials understand how to control the disease called COVID-19. ( ) 3. Alward is a doctor and an official representative of WHO, who led a team of scientists just back from China . ( ) 4. There is a special treatment for COVID-19. ( ) 5. Alward thinks that the death rate is not that bad because of the large number of mild cases. ( ) 6. Corona-virus cases are increasing in Japan , Italy and Iraq . ( ) 7. COVID-19 is a far deadlier infection than SARS. ( ) 8. Influenza is a different virus family whose death rate is far lower that what has been calculated so far for COVID-19. ( ) 9. Older adults who suffer from conditions like heart or lung disease are more at risk than other individuals. ( ) 10. The recovery time for those with mild cases can take up to six weeks.
A.
正确
B.
错误
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【单选题】There are so many kinds of Mp3 in the shop. We can't decide . [     ]
A.
what to buy
B.
to buy what
C.
which to buy
D.
to buy which
【单选题】____ they decide which college to go to, students should research the admission procedures.
A.
Once
B.
While
C.
Until
D.
As
【简答题】以下关于无线传感器网络协议栈的描述,正确的是( )A. 从无线联网的角度来看,传感器网络结点的体系由分层的网络通信协议、网络管理平台和应用支撑平台三个部分组成; B. 无线传感器网络的协议栈包括物理层、数据链路层、网络层、传输层和应用层,还包括能量管理、移动管理和任务管理等平台; C. 无线传感器网络的MAC层和物理层协议普遍采用的是Zigbee协议; D. IEEE 802.15.4的网...
【判断题】在中国,各种照明灯具、家用电器的额定电压一般都是380V。
A.
正确
B.
错误
【单选题】删除Goods表中,g_ID='040002'的商品信息语句是_______ from Goods where g_ID='040002'
A.
drop
B.
return
C.
delete
D.
以上都不是
【简答题】Exercise 1 Choose the best answer according to the text . Exercise 2 Decide whether the statements are True or False according to the text . Exercise 3 Complete the note according to the text.
【多选题】以下关于无线传感器网络协议栈的描述,正确的是 。
A.
从无线联网的角度来看,传感器网络结点的体系由分层的网络通信协议、网络管理平台和应用支撑平台三个部分组成;
B.
无线传感器网络的协议栈包括物理层、数据链路层、网络层、传输层和应用层,还包括能量管理、移动管理和任务管理等平台;
C.
无线传感器网络的MAC层和物理层协议采用的是IEEE 802.15.4协议;
D.
IEEE 802.15.4的网络特征与无线传感器网络存在很多相似之处,所以许多研究机构把它作为无线传感器网络的无线通信平台;
【单选题】The government has to decide whether cost or concern for the environment should take____when choosing the route for the new road crossing the well known scenic spot.
A.
solution
B.
sight
C.
intellect
D.
precedence
【简答题】无线传感器网络具有二维协议栈结构,即纵向的____和横向的____。
【多选题】Which of the following addresses can be assigned to a host when using a subnet mask of 255.255.254.0?()
A.
113.10.4.0
B.
186.54.3.0
C.
175.33.3.255
D.
26.35.3.255
E.
152.135.7.0
F.
17.35.36.0
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