下列事实中，能用勒沙特列原理来解释的是 A．由H2(g)、I2(g)、HI(g)

进程所请求的一次打印输出结束后，将使进程状态从

A．运行态变为就绪态

B．运行态变为等待态

C．就绪态变为运行态

D．等待态变为就绪态

1岁女孩，急起高热、流涎、厌食。查体：可见咽部充血，咽腭弓、悬雍垂、软腭等处可见2～4mm大小的疱疹，心肺 (－)，最可能的诊断是

A．疱疹性口炎

B．鹅口疮

C．猩红热

D．咽-结合膜热

E．疱疹性咽峡炎

This year some twenty-three hundred teenagers(young people aged from13~19)from all over the world will spend about ten months in U.S. homes. They will attend U.S. schools, meet U.S. teenagers, and form impressions of the real America. At the same time, about thirteen hundred American teenagers will go to other countries to learn new languages and gain a new understanding of the rest of the world.

Here is a two-way student exchange in action. Fred, nineteen, spent last year in Germany with George’s family. In turn, George’s son Mike spent a year in Fred’s home in America.

Fred, a lively young man, knew little German when he arrived, but after two months’ study the language began to come to him. School was completely different from what he had expected—much harder. Students rose respectfully when the teacher entered the room. They took fourteen subjects instead of the six that are usual in the United States. There were almost no outside activities.

Family life, too, was different. The father’s word was law, and all activities were around the family rather than the individual(个人). Fred found the food too simple at first. Also, he missed having a car.

“Back home, you pick up some friends in a car and go out and have a good time. In Germany, you walk, but you soon learn to like it.”

At the same time, in America, Mike, a friendly German boy, was also forming his idea. “I suppose I should criticize(批评)American schools,” he said. “It is far too easy by our level. But I have to say that I like it very much. In    Germany we do nothing but study. Here we take part in many outside activities. I think that maybe your schools are better in training for citizens. There ought to be some middle ground between the two.”

小题1:This year ________teenagers will take part in the exchange programme between America and other countries.

A．twenty-three hundred

B．thirteen hundred

C．over three thousand

D．less than two thousand小题2:The whole exchange programme is mainly to__________.

A．help teenagers in other countries know the real America

B．send students in America to travel in Germany

C．let students learn something about other countries

D．have teenagers learn new languages小题3: Fred and Mike agree that__________.

A．America food tasted better than German food

B．German schools were harder than American schools

C．Americans and Germans were both friendly

D．There were more cars on the streets in America小题4:What is particular in American schools is that________.

A．there is some middle ground between the two teaching buildings

B．there are a lot of after-school activities

C．students usually take fourteen subjects in all

D．students go out side to enjoy themselves in a car小题5:Which of the following is not true according to this passage?

A. There were few outside activities in Germany.

B. Fred had his own car when he was in America.

C. Subjects seemed easy for Mike in the USA.

D. All family activities were around the individual in Germany.

为了减少中频发电机的负载电流和内部压降，被测绕组需并联电容，使负载功率因数接近容性0.9。（）

乳化剂大致有（）等四类。