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问题 单项选择题

菌痢（）

A．病原体侵入肠黏膜上皮细胞和固有层引起病变

B．病原体侵入血液循环，形成菌血症

C．病原体在肠道内产生的毒素与肠黏膜上皮细胞的受体结合致病

D．病原体侵入肠黏膜下层引起黏膜下脓肿

E．由于病原体的过度繁殖，引起菌群失调

答案

参考答案：A

判断题

井下探放水应当使用专用的探放水钻机。
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单项选择题

An investor would most likely expect commodities to have correlations with traditional stock or bond investments and inflation, respectively, that are: Correlation with inflation Correlation with traditional stock or bond investments（）①A. positive positive ②B. positive negative ③C. negative positive

A. ①

B. ②

C. ③
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