在25℃、101kPa时,2molH2在O2中完全燃烧,生成2mol液态水,放出

题型:问答题

问题:

在25℃、101kPa时,2molH2在O2中完全燃烧,生成2mol液态水,放出571.6kJ热量,表示H2燃烧热的化学方程式为:______.

考点:热化学方程式
题型:问答题

在森林中旅游时,请不要随意丢弃饮料瓶.因为饮料瓶内一旦进入水后,相当于一个          镜,对太阳光有          作用,容易引发火灾.

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下列叙述正确的是(  )

A.将CO2通入BaCl2溶液中至饱和,无沉淀产生;再通入SO2,产生沉淀

B.在稀硫酸中加入铜粉,铜粉不溶解;再加入Cu(NO32固体,铜粉仍不溶

C.向AlCl3溶液中滴加氨水,产生白色沉淀;再加入过量NaHSO4溶液,沉淀消失

D.纯锌与稀硫酸反应产生氢气的速率较慢;再加入少量CuSO4固体,速率不改变

题型:问答题

People seem to have a natural need for friends and with good reason. Friends increase your enjoyment of life and relieve feelings of loneliness. They even can help reduce stress and improve your health. Having good friends is especially helpful when you are going through any kind of hard time such as when you are experiencing anxiety, panic attacks, or depression.

When you are with good friends you feel good about yourself, and you are glad to be with them. A friend is someone who —

●you like, respect, and trust, and who likes, respects and trusts you

●doesn’t always understand you, but accepts and likes you as you are, even as you grow and change

●allows you the space to change, grow, make decisions, and even make mistakes

●listens to you and shares with you both the good times and the bad times

●respects your need for secrets, so you can tell them anything

●lets you freely express your feelings and emotions without judging, teasing, or criticizing you

●accepts the limitations you have put on yourself and helps you to remove them

A person once said, “Friendship is a continuing source of bonding(连接), releasing, and creating in yourself and with the other person. There is an emotional bond between the two people.”

A good friend or supporter may or may not be the same age or the same sex as you, and may not have the same educational, cultural, or religious background, or share interests that are similar to yours. Friendships also have different depths. Some are closer to the heart and some more superficial, but they’re all useful and good.

小题1:Which of the following is NOT a function of a friend?

A.He brings you some happiness.

B.He helps you feel less lonely.

C.He helps you get over the difficulties.

D.He helps you cheat on the exam.小题2: The underlined word “superficial” means _______.

A.deep

B.hard

C.shallow

D.close小题3:Which is the best title for the passage?

A.A Friend in Need Is A Friend Indeed

B.What Kind of Person A Friend Should Be

C.To Be A Good Friend

D.How to Get on with Your Friend

题型:问答题

下列有关德尔菲法的表述,正确的是( )。

A.是专家们对影响组织某一领域发展的看法达成一致意见的结构化方法

B.实名进行

C.采用集体讨论的方法

D.目标是利用专家成员在问题讨论时的相互影响

题型:问答题

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