【单选题】【消耗次数：1】
子程序可以嵌套，嵌套深度最多为( )层。
①
9
②
5
③
6
④
8
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循环嵌套的概念哪个是对的
①
while可以嵌套for，不能嵌套dowhile
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dowhile不能嵌套for循环语句，可以嵌套while循环语句
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dowhile、while、for可以互相嵌套
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for后不只能嵌套for循环语句
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It is an ideal way to show materials and do presentations together
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Controller, assessor
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