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【多选题】
途中服务是指全陪在陪同旅游团离开旅游目的地的某地,前往下一站的路途上为旅游者提供的服务,主要有( )等内容。A.
向乘务人员介绍旅游团情况
B.
做好旅游者生活照料服务
C.
向乘务人员致谢
D.
与旅游者进行信息沟通
E.
保管好交通票据和行李托运单
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【简答题】Suppose users share a 2 Mbps link. Also suppose each user transmits continuously at 1 Mbps when transmitting, but each user transmits only 20 percent of the time. (See the discussion of statistical mu...
【单选题】The database administrator of your company created a public synonym called HR for the HUMAN_RESOURCES table of the GENERAL schema, because many users frequently use this table. As a user of the databa...
A.
You obtain the results retrieved from the public synonym HR created by the database administrator.
B.
You obtain the results retrieved from the HR table that belongs to your schema.
C.
You get an error message because you cannot retrieve from a table that has the same name as a public synonym.
D.
You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a Cartesian product.
E.
You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a FULL JOIN.
【简答题】What is the topic Sentence of fifth paragraphof Part B? Today you can avoid being restricted by proprietary software by not using it. If you run GNU/Linux or another free operating system, and if you ...
【简答题】Suppose users share a 2 Mbps link. Also suppose each user transmits continuosly at 1 Mbps when transmitting, but each user transmits only 20 percent of the time. (See the discussion of statistical mul...
【简答题】3 Suppose users share a 2Mbps link. Also suppose each user transmits continuously at 1 Mbps when transmitting, but each user transmits only 20 percent of the time. a. When circuit switching is used, h...
【简答题】( )是在网络层上实现多个网络互连的设备,它可以实现不同高层协议间的转换。
【单选题】The database administrator of your company created a public synonym called HR for the HUMAN_RESOURCES table of the GENERAL schema, because many users frequently use this table. As a user of the databa...
A.
You obtain the results retrieved from the public synonym HR created by the database administrator.
B.
You obtain the results retrieved from the HR table that belongs to your schema.
C.
You get an error message because you cannot retrieve from a table that has the same name as a public synonym.
D.
You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a Cartesian product.
E.
You obtain the results retrieved from both the public synonym HR and the HR table that belongs to your schema, as a FULL JOIN.
【单选题】Many users of this brand of mobile phones are known for __________________ their devices, to the point that they even give them various nicknames.
A.
wearing out
B.
being addicted to
C.
being accountable to
【简答题】在网络层上实现多个网络互连的设备是( )
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