若某二叉树的前序遍历访问顺序是abdgcefh,中序遍历访问顺序是dgbaechf,

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问题:

若某二叉树的前序遍历访问顺序是abdgcefh,中序遍历访问顺序是dgbaechf,则其后序遍历的结点访问顺序是( )。

A.bdgcefha

B.gdbecfha

C.bdgaechf

D.gdbehfca

考点:计算机等级考试C++二级C++笔试94
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教师知识结构的核心是教师的()

A.相关学科知识

B.教育学知识

C.心理学知识

D.专业知识

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分散相总是较基体强度和硬度高、刚度大。

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组成一个微型计算机系统时,处理器地址总线数据和______有关。

A.外存容量大小

B.内存容量大小

C.缓存的容量

D.执行速度

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焊接质量检验是发现(),以保证获得优质的焊接接头的重要手段。

A.焊接缺陷

B.焊接外部缺陷

C.焊接内部缺陷

D.焊接裂纹

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"Clean your plate!" and "Be a member of the clean-plate club!" Just about every kid in the US has heard this from a parent or grandparent. Often, it’s accompanied by an appeal. "Just think about those starving orphans (孤儿) in Africa!"
Sure, we should be grateful for every bite of food. Unfortunately, many people in the US take a few too many bites. Instead of saying "clean the plate," perhaps we should save some food for tomorrow.
According to news reports, US restaurants are partly to blame for the growing bellies (肚子). A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story.
Americans traditionally associate quantity with value and most restaurants try to give them that. They serve large portions to stand apart from competitors and to give the customers value. They prefer to have customers complain about too much food rather than too little.
Barbara Rolls, a nutrition professor at Pennsylvania State University, told USA Today, that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand.
Health experts have tried to get many restaurants to serve smaller portions. Now, apparently, some customers are calling for this too. A restaurant industry trade magazine reported last month that 57 percent of more than 4 000 people surveyed believed restaurants serve portions that are too large; 23 percent had no opinion; 20 percent disagreed.
But a closer look at the survey indicates that many Americans who can’t afford fine dining still prefer large portions. Seventy percent of those earning at least $150 000 per year prefer smaller portions, but only 45 percent of those earning less than $ 25 000 want smaller.
It’s not that working class Americans don’t want to eat healthy. It’s just that, after long hours at low-paying jobs, getting less on their plate hardly seems like a good deal. They live from paycheck to paycheck, happy to save a little money for next year’s Christmas presents.

According to the passage, working class Americans dining in restaurants ______.

A. eat less to save money
B. get less on their plate
C. want to get their money’s value back
D. do not care about their health

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