确定白喉棒状杆菌是否产生毒素的依据是()。
A.奈瑟染色有异染颗粒
B.吕氏斜面快速长出灰白菌落
C.亚碲酸钾平板呈黑色菌落
D.锡克试验
E.Elek平板试验
参考答案:E
A foreigner's first impression of the U.S. is likely to be ________ everyone is in a hurry ---- often under pressure.
a. what b. that c. which d. one in which
男,24岁,突然意识不清,跌倒,全身强直数秒钟后抽搐,咬破舌。2分钟后抽搐停止。醒后活动正常。
首先应考虑的疾病是()。
A.脑出血
B.脑血栓
C.蛛网膜下腔出血
D.癫痫
E.脑栓塞