由病毒侵入血液繁殖，引起的全身感染称为败血症
参考答案：错
It is known to us that without__ passport, travelling abroad is out of ___question.
A．a; the
B．不填；不填
C．the; a
D．the; 不填
主动脉瓣中度狭窄时瓣口面积为
A．＜0.75cm2
B．0.75～10cm2
C．1.1～1.75cm2
D．1.76～2.0cm2
E．2.1～4.0cm2
