皮皮学，免费搜题
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【单选题】
下述哪家不是国内提供移动上网的运营商
A.
中国铁通
B.
中国移动
C.
中国联通
D.
中国电信
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】The empty statement is represented by placing __________ where a statement would normally be.
A.
empty
B.
;
C.
null
D.
:
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【单选题】先秦君子的尚俭是以下哪组元素相结合的个人品格表现（）
A.
外交素质和大国道德
B.
军事素质和军人道德
C.
经济素质和商业道德
D.
政治素质和宗国道德
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【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);
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【单选题】使用 scanf( ) 和 printf( ) 函数时,必须在程序开头加上预处理命令 ( )。
A.
#include
B.
#include
C.
#include
D.
#include
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【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.
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【判断题】The null statement is an empty statement consisting only of a semicolon.
A.
正确
B.
错误
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【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.
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【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);
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【简答题】The report looks ________ (impression), but it’s really nothing but empty statement.
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【简答题】The report looks ________ (impression), but it’s really nothing but empty statement.A. impressive
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相关题目：
【单选题】The empty statement is represented by placing __________ where a statement would normally be.
A.
empty
B.
;
C.
null
D.
:
查看完整题目与答案
【单选题】先秦君子的尚俭是以下哪组元素相结合的个人品格表现（）
A.
外交素质和大国道德
B.
军事素质和军人道德
C.
经济素质和商业道德
D.
政治素质和宗国道德
查看完整题目与答案
【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);
查看完整题目与答案
【单选题】使用 scanf( ) 和 printf( ) 函数时,必须在程序开头加上预处理命令 ( )。
A.
#include
B.
#include
C.
#include
D.
#include
查看完整题目与答案
【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.
查看完整题目与答案
【判断题】The null statement is an empty statement consisting only of a semicolon.
A.
正确
B.
错误
查看完整题目与答案
【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.
查看完整题目与答案
【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);
查看完整题目与答案
【简答题】The report looks ________ (impression), but it’s really nothing but empty statement.
查看完整题目与答案
【简答题】The report looks ________ (impression), but it’s really nothing but empty statement.A. impressive
查看完整题目与答案