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【单项选择题】

In order for the automatic lifeboat drain to operate properly().

A、A.the cap should be removed to drain the boat when it is waterborne

B、B.the cage must be free of rubbish or the ball may not seat properly

C、C.there is an automatic ball check located in a siphon tube

D、D.the small lever to release the rubber ball float must be turned counterclockwise

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第8题

A、 displaying the total order value for sales representatives 161 and 163  B、 displaying theorder total for sales representative 161 inthe year 1999  C、 displaying the number of orders that have order mode online and order date in 1999  D、 displaying the number of orders whose order total is more than the average order total for all online orders  

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第9题

A、The sort is in ascending by order by default.  B、The sort is in descending order by default.  C、The ORDER BY clause must precede the WHERE clause.  D、The ORDER BY clause is executed on the client side.  E、The ORDER BY clause comes last in the SELECT statement.  F、The ORDER BY clause is executed first in the query execution.  

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第10题

A、The sort is in ascending by order by default.  B、The sort is in descending order by default.  C、The ORDER BY clause must precede the WHERE clause.  D、The ORDER BY clause is executed on the client side.  E、The ORDER BY clause comes last in the SELECT statement.  F、The ORDER BY clause is executed first in the query execution.  

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