A、B、C、D四种元素均为短周期元素,A的最外层电子数为B最外层电子数的2倍,C

题型:实验题

问题:

A、B、C、D四种元素均为短周期元素,A的最外层电子数为B最外层电子数的2倍,C的最高正价与最低负价的绝对值之差为2,A、B两元素形成的物质具有两性,C的最高价氧化物对应的水化物是强酸,D的最高价氧化物对应的水化物的碱性是短周期中碱性最强的,则:

(1)A的气态氢化物的电子式为                B离子的离子结构示意图为             

(2)D的最高价氧化物对应的水化物的化学式为          ,含有            键和

键。

(3)C单质的结构式           。

考点:构成物质的粒子—分子、原子、离子元素周期律
题型:实验题

患者欲了解有关梅毒的知识,正确解释是()

A.一种全身病变的性传播疾病

B.病原体抵抗力较强,对化学消毒剂不敏感

C.病原体不耐热,50℃1分钟内死亡

D.主要由性行为传播,不能通过污染衣物间接传染

E.可经产道传播,但不能通过胎盘

题型:实验题

阅读理解

      Years ago, when I started looking for my first job, wise advisers urged, "Barbara, be enthusiastic!

Enthusiasm will take you further than any amount of experience."

     How right they were!Enthusiastic people can turn a boring drive into an adventure, extra work into

opportunity and strangers into friends.

     "Nothing great was ever achieved without enthusiasm, " wrote Ralph Waldo Emerson.It is the paste

that helps you hang in there when the going gets tough.It is the inner voice that whispers, "I can do it!"

when others shout, "No, you can't."

     It took years and years for the early work of Barbara McClintock, a geneticist (遗传学家) who

won the 1983 Nobel Prize in medicine, to be generally accepted.Yet she didn't let_up on her experiments.Work was such a deep pleasure for her that she never thought of stopping.

    Author and poet Samuel Ullman once wrote, "Years wrinkle the skin, but to give up enthusiasm

wrinkles the soul."

    Enthusiastic people also love what they do, regardless of money or title or power.If we connot do

what we love as a fulltime career, we can treat it as a part-time interest, like the head of state who

paints, the nun (修女) who runs marathons, and the official who handcrafts (手工制作) furniture.

    We can't afford to waste tears on "might-have-beens". We need to turn the tears into sweat as

we go after "what-can-be".

     We need to live each moment wholeheartedly, with all our senses-finding pleasure in the fragrance

of a back-yard garden, the crayoned (蜡笔的) picture of a six-year-old, the enchanging, beauty

of a rainbow.It is such enthusiastic love of life that puts a sparkle in our eyes, a lift in our steps and

smoothes the wrinkles from our souls.

1. What can be the best title of this passage?

A. Find pleasure in what you are doing

B. Wake up your life

C. To give up enthusiasm wrinkles the soul

D. No pains, no gains

2. What conclusion does the writer draw through the experience of finding a job?

A. Enthusiasm will take you further than any amount of experience.

B. Years wrinkle the skin, but to give up enthusiasm wrinkles the soul.

C. We can't afford to waste tears on "might-have-beens".

D. Enthusiastic people can turn a boring drive into an adventure, extra work into opportunity and strangers into friends.

3. Which of the following statements is WRONG according to the passage?

A. No one can achieve great success without enthusiasm.

B. Enthusiasm will take a person further than any amount of his experience.

C. We should make great efforts to do the thing that can be done instead of regretting for the past.

D. Barbara McClintock was generally accepted many years before she won the Nobel Prize.

4. Which of the following can replace the underlined phrase "let up"?

A. continue  

B. make less effort

C. make great effort  

D. stop

5. We can learn from the last paragraph that it is________that makes our life meaningful.

A. love of gardening

B. love of drawing pictures with the crayon of a six-year-old child

C. love of life

D. love of beautiful rainbow

题型:实验题

糖尿病的诊断标准中空腹血糖应为下列哪一项()。

A.空腹血糖大于126mg/dl

B.空腹血糖大于140mg/dl

C.空腹血糖大于120mg/dl

D.空腹血糖大于200mg/dl

E.空腹血糖大于160mg/dl

题型:实验题

从所给的四个选项中,选择最合适的一个填入问号处,使之呈现一定的规律性()

A.

B.

C.

D.

题型:实验题

告警模块的输出电压控制方式有三种,分别是()和()。

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