阅读以下说明和流程图，回答问题1和问题2，将解答填入答题纸的对应栏内。
【说明】
为便于管理，每本正式出版的图书都印有国际标准书号。标准书号由“ISBN”和10个数字组成，其格式为：ISBN 组号-出版者号-书名号-校验码。其中，校验码是根据前面 9 个数字计算得到的，用于计算机自动校验。假设标准书号的 10 个数字依次是a(1)， a(2)， …， a(10)，则校验码 a(10)的设置应使 S=10*a(1)+9*a(2)+8*a(3)+…+1*a(10)能被11整除。如果校验码a(10)应设置成10，则规定以“X”表示之。例如，信息处理技术员考试大纲的标准书号为：ISBN 7-302-11191-X。第 1 段上的数字“7”是国际 ISBN中心分配给中国ISBN中心管理的组号。第2段上的“302”表示清华大学出版社。标准书号的校验过程如图1-1所示，计算校验码的过程如图1-2所示，其中，Mod(S，11)表示S 除以11得到的余数。
【流程图】
【问题1】请填补流程图中的空缺（1）～（4）。
【问题2】设“程序员考试大纲”标准书号前9个数字为7-302-08493，请写出其校验码。
正确答案及解析
正确答案
解析
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