皮皮学，免费搜题
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搜题
【单选题】
正常止血过程取决于( )A.
血小板的质和量及血管壁的正常
B.
皮肤的完整性和凝血因子的正常
C.
血小板的质和量、完整的血管壁和凝血因子的正常
D.
血小板的质和量、凝血因子的正常
E.
血因子，骨髓、血小板的质和量的正常
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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.
:
【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】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
【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
相关题目：
【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
参考解析：
知识点：
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