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【单选题】
下述关于授权的论断中正确的是 ( )。A.
授权不必授责
B.
书面授权才具效力
C.
授权必须通过职位进行
D.
授权是授权者的一种个人行为
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举一反三
【多选题】以下关于元件的说法正确的是( )
A.
元件只需创建一次，可在整个动画中重复使用。
B.
利用元件可以使编辑动画、创建复杂的交互变得更为简单。
C.
元件是Flash中一种比较独特的、可重复使用的对象。
D.
元件可以是图形，也可以是动画。
【单选题】You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty.Which statement accomplishes this task?（）
A.
ALTER TABLE students ADD PRIMARY KEY _ id;
B.
ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student_id);
C.
ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY student_id;
D.
ALTER TABLE students ADD CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
E.
ALTER TABLE students MODIFY CONSTRAINT stud_id_pk PRIMARY KEY (student_id);
【单选题】Given that the current directory is empty, and that the user has read and write permissions, and the following: Which statement is true?（）
A.
Compilation fails.
B.
The file system has a new empty directory named dir.
C.
The file system has a new empty directory named newDir.
D.
The file system has a directory named dir, containing a file f1.txt.
E.
The file system has a directory named newDir, containing a file f1.txt.
【单选题】Given that the current directory is empty, and that the user has read and write privileges to the current, and the following: Which statement is true?（）
A.
Compilation fails.
B.
Nothing is added to the file system.
C.
Only a new file is created on the file system.
D.
Only a new directory is created on the file system.
E.
Both a new file and a new directory are created on the file system.
【单选题】You need to modify the STUDENTS table to add a primary key on the STUDENT_ID column. The table is currently empty.Which statement accomplishes this task?（）
A.
ALTER TABLE students ADD PRIMARY KEY student_id;
B.
ALTER TABLE students ADD CONSTRAINT PRIMARY KEY (student _ id);
C.
ALTER TABLE students ADD CONSTRAINT stud _ id _pk PRIMARY KEY (student _ id);
D.
ALTER TABLE students MODIFY CONSTRAINT stud _ id _pk PRIMARY KEY (student _ id);
【简答题】The report looks ________ (impression), but it’s really nothing but empty statement.
【简答题】The report looks ________ (impression), but it’s really nothing but empty statement.A. impressive
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