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【单选题】
一个学生每月从父母那里得到500元的生活费。假如他对大米的需求函数为x(p，m)＝20/p+500/m。如果大米的价格从每千克4元涨到6元，为了保证他的生活水平不下降，他的生活费应从500元增加到( )元。A.
506
B.
508
C.
510
D.
512
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反馈参考答案：
举一反三
【单选题】Which of the following statements is true about grammar practice?
A.
When doing transformation drills, the students also need to change the forms of the given prompts
B.
In substitution drills, the students change a given structure in a way so that they are exposed to another similar structure
C.
In meaningful practice the focus is on the production, comprehension or exchange of meaning
D.
An activity cannot have elements of both mechanical and meaningful practice
【单选题】关于SecondaryNameNode哪项是正确的?
A.
是NameNode的热备
B.
对内存没有要求
C.
帮助NameNode合并edits和fsimage
D.
SecondaryNameNode应与NameNode 部署到一个节点
【单选题】关于SecondaryNameNode哪项是正确的
A.
它是NameNode的热备
B.
它对内存没有要求
C.
它的目的是帮助NameNode合并编辑日志，减少NameNode启动时间
D.
SecondaryNameNode应与NameNode部署到一个节点
【单选题】Which of the following statement is true about grammar practice?
A.
When doing transformation drills, the students also need to change the forms of the given prompts.
B.
In substitution drills, the students change a given structure in a way so that they are exposed to another similar structure.
C.
In meaningful practice the focus is on the production, comprehension or exchange of meaning.
D.
An activity cannot have elements of both mechanical and meaningful practice.
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