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【单选题】
在调幅信号的解调过程中，检波的作用是 。A.
恢复载波信号
B.
恢复调制信号的幅值和极性
C.
恢复已调制波
D.
恢复调制信号的幅值
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举一反三
【单选题】public class class1 { private string _Data=””; public string Data{set{_Data=value;}} } 创建该类的对象obj后,下列哪个语句是合法的( )
A.
ojb.Data=”It is funny”;
B.
Console.Write(obj.Data);
C.
Obj._Data=100;
D.
Obj.set(obj.Data);
【单选题】下列关于数据集Data Set的说法,错误的是()
A.
在Data Set中可以包含多个Data Table
B.
Data Set可以简单地理解为一个临时数据库
C.
在与数据库断开连接后，Data Set中的数据会消失
D.
Data Set是数据源中检索到的数据在内存中的缓存
【单选题】Assuming that the data set Company.USA has five or more observations, what is the result of submitting the following program? data work.getobs5(drop=obsnum); obsnum=5; set company.usa(keep=manager pay...
A.
an error
B.
an empty data set
C.
a continuous loop
D.
a data set that contains one observation
【单选题】A data warehouse is a subject-oriented data set used for reporting and analusis. Data warehouses can be subdivided into ( ). Which store subsets of data from a warehouse.
A.
OLTPs
B.
transactions
C.
data sarts
D.
OLAPs
【简答题】Data set
【单选题】For data transmission to be successful，sending and receiving devices must follow a set of communication rules for the exchange of information. These rules are known as（ ）.
A.
E-mail
B.
Intemet
C.
network
D.
protocols
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