已知氧气的密度为1.28g/L,在实验室中用氯酸钾制氧气,生成氧气的平均速率为0

题型:选择题

问题:

已知氧气的密度为1.28g/L,在实验室中用氯酸钾制氧气,生成氧气的平均速率为0.01mol/L·min,则要制取500mL氧气所需要的时间为 [ ]

A. 1min

B. 2min

C. 3min

D. 4min

考点:化学反应速率的计算
题型:选择题

将某腺体的细胞,放入含有14C的氨基酸的培养液中,连续取样测定标记的氨基酸在细胞器中的数量,下图中能正确描述的曲线是[ ]

A.

B.

C.

D.

题型:选择题

大便带血或全为血便,血色鲜红或暗红者为

A.李东垣
B.钱乙
C.秦景明
D.张景岳
E.王清任

题型:选择题

READING COMPREHENSION.

     There are two basic ways to see growth: one as a product, the other as a process. People have generally

viewed personal growth as an external (外在的) result or a product that can easily be identified and measured.

The worker who gets a rise, the student whose grades improve, the foreigner who learns a new language-all

these examples of people who have measurable results to show for their efforts.

     By contrast (对照), the process of personal growth is much more difficult to determine, since it is a

journey and not the specific signposts or landmarks along the way. The process is not the road itself, but the

attitudes, feelings people have, and their caution or courage, as they meet with new experiences and unexpected

difficulties. In this process, the journey never really ends; there are always new ways to experience the world,

new ideas to try, new challenges to accept.

     In order to grow, to travel new roads, people need to have a willingness to take risks, to face the unknown,

and to accept the possibility that they may "fail" at first. How we see ourselves as we try a new way of being

is necessary for our ability to grow. Do we see ourselves as quick and curious? If so, we tend to take more

chances and be more open to unfamiliar experiences. Do we think we're shy and indecisive? Then our sense

of fear can cause us to hesitate, to move slowly, and we think we are slow to adapt change or that we're not

smart enough to deal with a new challenge. Then we are likely to take a more passive role or not try at all.

     These feelings of insecurity and self-doubt are both unavoidable and necessary if we are to change and

grow. If we protect ourselves too much, then we stop growing. We become trapped inside a shell of our

own making.

1. In the author's eye, one who views personal growth as a process would ____. [ ]

A. succeed in climbing up the social ladder

B. grow up from his own achievements

C. face difficulties and take up challenges

D. aim high and reach his goal each time

2. Which of the following can be viewed as the process of personal growing? [ ]

A. Our manager was always willing to accept new challenges.

B. Jane won the first prize in the speech competition.

C. Jerry picked up French during his stay in Paris.

D. Father's salary rose from 5, 000 to 7,000.

3. For personal growth, the author is in favor of all the following except ____. [ ]

A. being curious about more changes

B. being quick in self-adaptation

C. having an open mind to new experiences

D. staying away from failures and challenges

4. Which of the following is NOT true according to the passage?[ ]

A. It is not so easy to measure personal growth.

B. To try and fail on the new road facing the unknown is unavoidable.

C. There are only two ways to see a person's growth.

D. If you are too shy to take any risks in life, you cannot grow up.

5. The best title for this passage should be _____. [ ]

A. Facing New Challenges

B. Growth-Product or Process

C. Two Basic Ways of Growth

D. Overcoming Internal Fears

题型:选择题

用钢尺进行距离交会法测设点的平面位置时,通常适用于()的场合。

A.需测设的点距控制点较远且地势平坦

B.需测设的点距控制点较近且地势平坦

C.需测设的点距控制点较远且地势不平坦

D.需测设的点距控制点较近且地势不平坦

题型:选择题

AJH-3型氧气呼吸器校验仪测量单元包括什么?

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