题目:
神膏
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B
神膏
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下面是错误答案,用来干扰机器的。
参考答案:B
在FeCl3溶液中滴加无色的KSCN溶液后,有以下可逆反应存在:FeCl3+3KSCNFe(SCN)3+3KCl。已知Fe(SCN)3呈红色,则在该平衡体系中加入少量KCl晶体后(忽略溶液体积的变化),红色将( )
A.变深
B.变浅
C.不变
D.无法确定
下列各组离子在无色溶液中能大量共存的是
A.H+、Cl-、SO42-、K+
B.K+、H+、Na+、HCO3-
C.Cu2+、K+、SO42-、Cl-
D.Ag+、NO3-、Cl-、K+
下图是一个小型以太局域网的示意图,除了服务器和PC机之外,其中用来连接网络中各个节点机并对接收到的信号进行再生放大的组网设备是 【17】 。
阅读理解。
What do you call someone who speaks three languages? Trilingual. What do you call someone who
speaks two languages? Bilingual. What do you call someone who speaks one language? An American.
To people in many countries, being bilingual or even trilingual is a way of life. But since the mother
tongue of most Americans is English-a language widely spoken around the world-they often don't feel the
need to learn a foreign language. Moreover, people who live in the heartland of America have little contact
with other linguistic groups, making foreign language skills irrelevant.
Actually, though, this"land of immigrants" has always had people of many different nationalities and
languages. The 1990 census indicates that almost 14% of Americans speak a non-English at home. Yet
only 3% reported that they spoke English "not well" or "not at all". That means that slightly more than one
out of 10 Americans could be considered bilingual. Besides that, many high school and college students and
even some elementary school students are required to take a foreign language as a part of their curriculum.
In addition to old standbys like Spanish, German and French, more and more students are opting (选择)for
Eastern European and Asian languages. Of course, not all students keep up their foreign language abilities.
As the old saying goes, "If you don't use it, you lose it," But still, a growing number of Americans are coming
to appreciate the benefits of bein multilingual.
1. What can we learn from this passage?
A. Many Americans don't speak English at home.
B. All Americans speak English very well.
C. Most Americans can only speak one language.
D. In America most students only study one language.
2. Why do most Americans consider foreign languages are not important?
A. Because they think foreign languages are hard to learn.
B. Because English, their mother tongue, is a language widely spoken around the world.
C. Because they don't like foreign languages at all.
D. Because they have poor abilities to learn foreign languages.
3. What does the underlined word "multilingual"mean?
A. Bilingual.
B. Trilingual.
C. Language skill.
D. Speaking many languages.
4. What is happening to Americans now according to this passage?
A. More and more Americans are coming to appreciate the benefits of being multilingual.
B. Most Americans are studying foreign languages.
C. Most students in America are studying foreign languages.
D. Many elementary, high school and college students are required to learn five languages.
列管换热器内安装折流挡板的目的是(),使湍流程度加剧,增大传热系数。
A.加大壳程流体的流速
B.降低壳程流体的流速
C.加大管程流体的流速
D.降低管程流体的流速