The first paratyphoid early clinical symptoms were mainly fever, dizzy, headache, pharyngoxerosis, pharynx-ache and dry-cough with 7-27 days of incubation period, average 15 days.
甲型副伤寒早期临床症状以发热、头晕、头痛、咽干、咽痛、干咳为主，潜伏期7 ~ 27天，平均15天。
The results show that there was an obvious incubation period of crack forming, at first some pits appeared on the verge of the sample notch;
结果表明：此过程存在明显的裂纹萌生孕育期：首先在缺口边缘上出现凹坑；
The results show that there was an obvious incubation period of crack forming, at first some pits appeared on the verge of the sample notch;
结果表明：此过程存在明显的裂纹萌生孕育期：首先在缺口边缘上出现凹坑；
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