A.6个月
B.9个月
C.12个月
D.18个月
第1题
第2题
第3题
第4题
第5题
第6题
第7题
A.img src='https://status.shangxueba.com/ask/shiti/2021/2021-01-01/2016071515292214202.gif' />
B.img src='https://status.shangxueba.com/ask/shiti/2021/2021-01-01/2016071515293849393.gif' />
C.img src='https://status.shangxueba.com/ask/shiti/2021/2021-01-01/2016071515294823268.gif' />
D.img src='https://status.shangxueba.com/ask/shiti/2021/2021-01-01/2016071515295556960.gif' />
第8题
A.img src='https://status.shangxueba.com/ask/shiti/2020/2020-12-24/2014122315544274057.png' />
B.img src='https://status.shangxueba.com/ask/shiti/2020/2020-12-24/2014122315545086961.png' />
C.img src='https://status.shangxueba.com/ask/shiti/2020/2020-12-24/2014122315545783542.png' />
D.img src='https://status.shangxueba.com/ask/shiti/2020/2020-12-24/2014122315550490272.png' />
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