设X服从参数为λ的泊松分布,且E(X2+2X-4)=0,则P(X≥1)=______.
Read the following tongue twisters. Better to know everything of something than something of everything.
Is there a ______ between smoking and lung disease (nick, link)
结核病具有诊断意义的病理改变是
A. 坏死性肉芽肿
B. 巨噬细胞增生
C. 结核结节
D. 纤维组织增生
E. 钙化