题目内容

病原菌进入机体能否引起疾病决定于

A. 细菌的毒力大小
B. 细菌在体内繁殖和扩散
C. 细菌毒素毒性的强弱
D. 菌的毒力大小、侵入部位和数量,机体防御机能和免疫力形成的强弱

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病原菌侵入血流并在其中大量繁殖,造成机体严重损伤,引起严重的全身症状称为

A. 毒血症
B. 菌血症
C. 败血症
D. 脓毒血症

There are ______ in many bigger cities in Asia,the USA and Europe.

San Francisco's Chinatown is probably ______ outside Asia.

There are 78 __1_ , 53 _2_, 12 3_, two banks and many business companies in London's Chinatown.