头孢菌素类的抗菌机制是() A.抑制细菌蛋白质合成 B.抑制细菌细胞壁合成 C.与P

题型:单项选择题 B1型题

问题:

头孢菌素类的抗菌机制是()

A.抑制细菌蛋白质合成

B.抑制细菌细胞壁合成

C.与PABA竞争二氢叶酸合成酶

D.抑制二氢叶酸还原酶

E.抑制DNA回旋酶

考点:中医主治医师基础知识主治中医(中医妇科)基础知识模拟试题四
题型:单项选择题 B1型题

执行机会的多少具体体现在几个方面。其中不包括()。

A.受训者是否执行过该类型任务

B.受训者执行了多少资该类型任务

C.可用于工作当中的培训内容的数量

D.难度大且富有挑战性的该类型任务的执行情况

题型:单项选择题 B1型题

阅读理解, 根据短文内容,选择最佳选项.

    The nine-year-old Marc Yu is called Little Mozart. He is too short to reach the pedals  (踏板) of a

piano. Marc, from California, USA, says, "The problem is that my legs aren't straight enough, so I have

to get very close to the piano."

    Marc's 34-year-old mother played Beethoven's CDs to him when she was pregnant (怀孕的). Marc

started playing the piano at a birthday party when he was only two. While the other children were  singing "Twinkle, twinkle, little star …", he walked over to the piano and started playing the song. It  astonished

his mother, because that was the first time he'd been near a piano. Marc gave his first public performance,

playing Beethoven, at six, the same age as Mozart. After that concert, Marc won a £225,000 university

scholarship (奖学金).

    At present he practices the piano eight hours a day. He also studies  part-time at the famous  Colbum

Music School  in Los Angeles, and  flies once a month to China for lessons at Shanghai Music School.

Marc  says, "I like  playing  the piano  because it makes me have a  lot of different  feelings - sadness,

excitement, happiness and so on. I like playing  difficult pieces,  especially those that my teacher says I

shouldn't."

1. The nine-year-old Marc Yu is from        .

A. China

B. France

C. Canada

D. the United States

2. Marc played the piano at the age of        for the first time.

A. two        

B. five        

C. six          

D. nine

3. According to the passage, the underlined word "astonished" means "     " in Chinese.

A. 使……理解

B. 使……担心

C. 使……惊奇

D. 使……难过

4. At present Marc practices playing the piano        .

A. once a month

B. eight hours a day

C. in his free time            

D. only on weekends

5. What Marc says in the last paragraph tells us that       .

A. he likes challenges

B. he doesn't like challenges

C. he is afraid of challenges

D. he wants to give up music

题型:单项选择题 B1型题

矿产资源开发项目的资源条件评价中,属于地矿工作分析研究的是()。

A.储量计算参数的确定

B.勘探工程量

C.矿体圈定原则

D.储量计算方法

题型:单项选择题 B1型题

若不慎将体温计打破,散落出的汞产生的汞蒸汽会对人体产生危害,此时可洒一些硫在上面,使硫与汞发生化合反应生成硫化汞(HgS).

(1)写出硫与汞反应的化学方程式______.

(2)用分子、原子观点解释体温计测量体温时汞柱上升的现象______.

题型:单项选择题 B1型题

吊起工具前,不为自己选择安全的站位的违章级别是什么?

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