毒蛇咬伤中毒后常采用下列处理措施,最有效的为()
A.绷扎伤口上方近心端肢体
B.伤口清创
C.外敷和内服蛇药
D.注射单价特异抗蛇毒血清
E.注射多价抗蛇毒血清
参考答案:D
— Is Tom at school today?
— No, he is at home ______ he has got a bad cold.
A.so
B.or
C.because
D.if
肺泡表面活性物质的作用,下述哪一项是错误的
A.降低肺泡表面张力
B.防止肺萎缩
C.减小肺顺应性
D.维持肺泡容积相对稳定
E.防止体液在肺泡积聚