一定条件下，在容积固定的某密闭容器中发生的反应N2+3H22NH3。在10s内

发布时间：2017-10-20 00:25 │ 来源：www.tikuol.com

题型：选择题

问题：

一定条件下，在容积固定的某密闭容器中发生的反应N₂+3H₂2NH₃。在10s内

的浓度由5mol／L降至4mol／L下列说法正确的是（）

A．用表示的化学反应速率为0．1mol／(L·s)

B．使用合适的催化剂，可以加快该反应的速率

C．增加的浓度或降低温度都会加快该反应的速率

D．反应足够长时间，、中至少有一种物质浓度降为零

考点：化学反应速率的定义、公式

题型：选择题

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The youngest international player
The youngest international player was an 8-year-old table tennis player from Jamaica. Her name was
Joy Forster. She wan the Jamaican table tennis champion in 1985 and she played in the Jamaican
international team that year.

The most popular sport
Yes, you guessed right! The most popular team game in the world is football. People play football in
villages, streets and stadiums all over the world. The most famous football competition is the World Cup.
It happens every four years. In the past, football was a game just for men, but now half the countries in
the world have an international women's team, too. The first Women's World Cup was in 1991.

1. Joy Forster was _____ table tennis player in the world.
    A. the youngest
    B. the best
    C. the most popular
    D. the oldest
2. She played _____ .
    A. tennis
    B. for her country
    C. against Jamaica
    D. football
3. People play football in _____ .
    A. villages
    B. streets
    C. stadiums
    D. A, B and C
4. The World Cup _____ .
    A. is held every year
    B. is well-known all over the world
    C. is a game just for men now
    D. is a game just for students
5. There was no World Cup for women players _____ 1991.
    A. before
    B. in
    C. after
    D. to

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缩窄性心包炎最常见的原因是（）

A.化脓性心包炎

B.结核性心包炎

C.非特异性心包炎

D.心包转移瘤

E.尿毒症

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下列有关说法正确的是(N_A为阿伏加德罗常数) ( )

A．工业上粗铜的电解精炼时，每转移1mol电子时阳极上溶解的铜小于0.5N_A

B．1.12L Cl₂含有1.7N_A个质子

C．1mol NaHSO₄固体中含阴阳离子数为3N_A

D．将1mol NO₂气体在降温后颜色变浅，但其所含的分子数仍然为N_A

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题型：选择题

治疗皮肌炎的首选药物为________，其代表药物为________。

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题型：选择题

与传统的知识产权保护方法相比，采用商业秘密保护手段的优势是（）。

A.所保护的对象具有广泛性

B.保护期限具有优势

C.具有地域优势

D.可以对抗独立开发出同一秘密技术的第三人

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