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【单选题】
第五套人民币10元纸币安全线包含的防伪措施是( )A.
全息，磁性，开窗
B.
磁性，荧光，开窗
C.
全息，荧光，开窗
D.
荧光，开窗
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反馈参考答案：
举一反三
【简答题】放大镜实际上就是一只______镜，我们通过放大镜看到物体的像是______、______、______像；使用时，必须将物体放在透镜的______以内．
【单选题】In a university database, the student table, with student ID as a primary key, is linked to the university department table through its primary key-department ID. In the student table, department ID i...
A.
foreign key
B.
primary key
C.
complex key
D.
functional key
【单选题】A primary key in a database is a ________.
A.
group of rows that identifies a unique table or file
B.
column or group of columns that identifies a unique row in a table
C.
group of fields or columns that represent metadata
D.
group of tables or files formed to identify a unique field or row
E.
group of records that identifies similar attribute
【判断题】A foreign key is an attribute in a table that is a primary key in another table.
A.
正确
B.
错误
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