abstract：gggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggddg方法嘎嘎嘎嘎嘎過過過過過過過過過過過過過過過過

gggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggggddg方法嘎嘎嘎嘎嘎過過過過過過過過過過過過過過過過

Correcting teacher：天蓬老師Correction time：2019-04-04 10:53:11
Teacher's summary：你的作業(yè) ,已經(jīng)掛了幾天了, 算是處罰, 這次先過, 下次不允許這樣