耐甲氧西林金黄色葡萄球菌(MRSA)的耐药机制是A．产生β-内酰胺酶_爱下问搜题

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问题单项选择题

耐甲氧西林金黄色葡萄球菌(MRSA)的耐药机制是

A．产生β-内酰胺酶，分解药物

B．由于细菌青霉素结合蛋白组成的变化而致药物失效

C．药物不能渗入MRSA细胞内部

D．由于外渗作用，使已吸收的药物不断排出而降效

E．药物在细菌细胞内部复生分解作用

答案

参考答案：A

解析：耐甲氧西林金黄色葡萄球菌 (MRSA)的耐药机制：产生β-内酰胺酶，水解青霉索类。

完形填空

One day a rich man was invited to dinner at the home of one of his friends. He did not know what to   36  the wine, meat and chicken he had just bought. Certainly he could not    37   them to the servant. Then he had   38   idea. He called up the servant and    39  to him.
"I'll be away for the whole evening, and I'll leave you to look after the house. In the cupboard there are two bottles filled with    40 . Be careful about it. You'll be killed if you take even a   41   of it. There is also some meat and chicken in the cupboard. Take care of them".    42  these words the rich man left the home.
43  the master turned his back, the servant opened the cupboard and began to enjoy all the nice things in it. He   44  the two bottles and ate up the meat, the chicken and   45 he found in the cupboard. He was   46  and soon fell 47 .
At mid-night the rich man returned home. He looked into the cupboard and to his great 48  , all the wine and food were   49 . He was mad with   50 and called the servant up.
"Oh, Master," the servant began to say   51 the rich man could open his mouth; "while you were away, the neighbor's black cat stole into our kitchen and ate up every things in the cupboard. I know you would be angry with me. I was so   52  that I drank the two bottles of poison to kill   53  “there were tears in the servant's eyes.”Oh, Master," he continued, "Please don't get angry with a 54 _ man. I'll soon be dead.
The rich man, of course, did not   55 a word of his story. But again, he could do nothing about it.

C．Hardly when

D．everything else

D．disappointed

D．disappeared

D．the neighbor

选择题

内能转化为机械能的是 ( )

A．人造卫星的运载火箭点火发射，火箭升空

B．水从高处冲下，带动水轮机转动

C．用酒精灯对铜棒加热

D．流星在地球大气层中焚烧