１．名词解释:病原微生物　致病性　毒力　侵袭力　传染　传染病　ＭＬＤ　ＬＤ５０   &nbs4XaxDTDCWN16XtUca4voJOzE/lW/K2g1blZhylFgQhQ=p;   1fDr/avVjAz1HXC4KqCAZaNIqdvxcvrNFIcT0NOiRT（试读）...