动铁式弧焊变压器结构紧凑,移动灵活,引弧容易,焊接电流调节均匀。( )
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弧焊变压器是一种弧焊电源。( )
A. 对
B. 错
下列在student表上创建view_stu视图的语句中，正确的是
A. CREATE VIEW view_stu IS SELECT * FROM student;
B. CREATE VIEW view_stu AS SELECT * FROM student;
CREATE VIEW view_stu SELECT * FROM student;
D. CREATE VIEW SELECT * FROM student AS view_stu;
下面选项中，创建视图所应当具备的权限是
A. CREATE VIEW权限
B. USE VIEW权限
C. SHOW VIEW权限
D. CREATE TABLE权限
下面选项中，用于创建视图的语句是
A. DECLARE VIEW
B. CREATE VIEW
C. SHOW VIEW
D. NEW VIEW
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