“mn>0”是“mx2+ny2=mn为椭圆”的什么条件 [ ]
A.必要不充分
B.充分不必要
C.充要
D.既不充分又不必要
答案:A
阅读短文,判断正(√)误(×)。
My name is Jenny. I am a school girl. I am ten years old. I'm tall and thin. I have a beautiful bag. It is blue.
I like my bag. This is my English teacher. He is Mr. Brown. He has got a black bicycle. He goes to school by
bicycle. I have got a good friend in the school. He is Jack.
( ) 1. Jenny is a girl.
( ) 2. Jenny is not short.
( ) 3. Jenny has a blue bag.
( ) 4. Mr. Brown is Jenny's father.
( ) 5. Mr. Brown goes to school by bus.
( ) 6. Jenny's good friend is Jack.
患者男性,36岁,因“头痛3日,加重伴恶心、呕吐9小时”来诊。患者于入院前3日因受凉感冒后出现头痛,呈全头部闷胀感痛,无发热,未予重视,休息后头痛无明显改善。入院前9小时头痛明显加重,伴恶心、呕吐,呕吐物为胃内容物,呈喷射状。查体:体温39.0℃,脉搏96次/分,呼吸23次/分,血压130/80mmHg(1mmHg=0.133kPa)。患者意识恍惚,精神差,烦燥,问答不切题。颅脑CT及肝功能、肾功能、电解质未见明显异常。血常规:白细胞11.72×109/L,中性粒细胞0.92。脑脊液常规:淡黄色,浑浊,无凝块,潘氏试验阳性,脑脊液细胞计数2.9×10个/L,其中单核细胞0.20,多核细胞0.80;脑脊液生化:糖4.48mmol/L,氯109mmol/L,蛋白1.27g/L。初步诊断为化脓性脑膜炎。
在碳青霉烯类中,最适宜用于化脓性脑膜炎患者的是()
A.亚胺培南
B.美洛培南
C.帕尼培南
D.比阿培南
E.厄他培南