典型的十二指肠溃疡的症状特点是
A. 进行性吞咽苦难
B. 进餐后上腹痛，至下一餐前缓解
C. 不洁饮食后上腹痛，伴呕吐.腹泻
D. 空腹及夜间上腹痛，进食后可缓解
E. 反酸.烧心伴胸骨后烧灼样痛
不安全食品实施三级召回的，食品生产者应当自公告发布之日起()个工作日内完成召回工作。
A. 10
B. 20
C. 30
D. 60
There are far too many individuals who never get to experience the joy of attaining their
Short of the impossible, the satisfaction we get from a lifetime depends on how high we choose our difficulties.
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