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【简答题】
若 x 2 = y 3 = z 4 ，则 x+2y-z x-y+2z =______．
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举一反三
【单选题】Not until he failed the exam _______he had left his books untouched .
A.
did he realize
B.
had he realized
C.
he realized
D.
he had realized
【单选题】若对一个具有一对多关联的表“实施参照完整性”，并且“级联更新相关字段”，则（ ）
A.
在子表中更改子关键字的值，将同时更新主表中所有相关记录的匹配值
B.
在主表和子表中同时更新关键字的值，将同时更新所有相关记录的匹配值
C.
在主表或子表中更新关键字的值，将更新所有相关记录的匹配值
D.
在主表中更改主关键字的值，将同时更新子表中所有相关记录的匹配值
【单选题】Not until most of the people had left the airport __________his sister was there.
A.
that he saw
B.
had he seen
C.
did he see
D.
that he had seen
【简答题】It was not until be arrived at the station ________ he realised he had forgotten his ticket. A) that B) before C) when D) after
【简答题】II 型系统对数幅频特性的低频段渐近线斜率为( )
【单选题】Not until he left his home ______ to know how important the family was for him.
A.
did he begin
B.
had he begun
C.
he began
D.
he had begun
【单选题】Not until he left home ______ to know _______ important the family was for him.
A.
did he begin; what
B.
had he begin; how
C.
did he begin; how
D.
had he begin; what
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