题目内容

频率与()的转速有关,转速越高,频率也越高。

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教师制订教学方案时,选择教学内容要符合那些要求?

盾构法施工用于穿越地面障碍的给排水主干管道工程,直径一般()以上。

A. 3000mm
B. 5000mm
C. 2000mm
D. 1000mm

涂料饰面的施工方法一般有喷刷()、刷涂、()、抹涂、与()等几种。

Which of the following SQL statements will return the year and average salary for all employees hired within a given year that have a salary greater than $30,000?()

A. SELECT * FROM t1 UNION SELECT * FROM t2
B. SELECT * FROM t1 UNION DISTINCT SELECT * FROM t2
C. SELECT * FROM t1 INTERSECT SELECT * FROM t2
D. SELECT * FROM t1 WHERE (c1,c2)= (SELECT c1,c2 FROM t2)

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