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1??????????????????
a??? b?? c??? d??? e???
2???????????????????????
a????? b????? c? ????? d????? e?????
3???????????????????????????
a????? b????? c?????? d????? e?????
4???????????????????????
a????<30?? b????2?? ? c???3??? d?????4???
e??? ?8???
5??????????????????????
a???? b??? c??? d????? e?????
6???????????????????
a????? b???? c??? e??? f?????
7?????????????????????
a????? b???? c??? d??? e?????
8????????????????????
a????? b???? c?????? d????? e?????
9???????????????????
a??? b?? c??? d??? f????
10?????????????????????
a????? b????? c?????? d????? e?????
????????13?
???10-13?
??>13?
