在心脏听诊方面,对分析诊断心律失常最有价值的心音是() A.第一心音和第二心音

题型:单项选择题

问题:

在心脏听诊方面,对分析诊断心律失常最有价值的心音是()

A.第一心音和第二心音

B.第一心音和第三心音

C.第一心音和第四心音

D.第二心音和第三心音

E.第三心音和第四心音

考点:心血管内科(医学高级)心律失常心律失常题库
题型:单项选择题

—Who’s _____ woman in purple?

—Peter’s mother. She works in ______university.

A.a; a

B.the; an

C.a; an

D.the; a

题型:单项选择题

我国四个直辖市中位于最西边的是[     ]

A.北京

B.上海

C.天津

D.重庆

题型:单项选择题

我国的三大政治制度是指( )。
①民族区域自治制度 ②人民代表大会制度
③特别行政区制度 ④多党合作和政治协商制度

A.①②③
B.①②④
C.①③④
D.②③④

题型:单项选择题

根据下面一段文字的内容,按要求介绍“木棉花”。(8分)

木棉又名红棉、攀枝花。中国关于木棉的记载最早见于晋代葛洪的《西京杂记》,西汉时,南越王赵佗向汉帝进贡烽火树,“高一丈二尺,一本三柯,至夜光景欲燃”,据说烽火树就是木棉树

木棉通常3、4月份开花,木棉花较大,色彩橙红,极为美丽,可供欣赏。

广东人常以木棉花的花序或纤维作棉絮,做棉衣、棉被、枕垫;木棉花还可以做药,每逢春末采集,晒干,经拣除杂质和清理洁净后,用水煎服,可清热去湿;木棉的材质轻软,可供蒸笼、包装箱之用。广东人对木棉有着特殊的情感,就是因为它一直造福岭南。

木棉是木棉科落叶大乔木,属于速生、强阳性树种,树形有阳刚之美,树高可达25米,树冠常高出周围的树群,以争取阳光雨露,因为这种奋发向上的精神,木棉被人誉为英雄树、英雄花

木棉花是广州市和高雄市的市花,阿根廷的国花。

假如你以导游的身份带第一次到岭南的游客在广州旅游,在花朵盛开的木棉树旁经过,你会怎样向他们介绍木棉?(不超过80字)

题型:单项选择题

By 2010 the European Commission predicts transcontinental freight traffic will have risen 50 percent as a result of European expansion, and much of that will have to cross the enormous obstacle of the Alps. Right now the only practical way for most heavy traffic to get through is by truck and tunnel. And while that could change if safer and cleaner rail lines were opened, the chances are that won’t happen anytime soon.

Several private trucking companies have adapted quickly and creatively to the demands of European unification. Some of the bigger truckers trace cargoes with the Global Positioning System and sophisticated computers. And if trucks also bring more road hazards and pollution, at present there is no alternative. Right now only 8 percent of European merchandise moves by rail, compared with more than 40 percent in the United States. Delays are so common that the average speed for freight is about 18km an hour.

The railways have had trouble outgrowing a heritage of national rivalries and open warfare between Europe’s countries. The result is what another European Commission report calls "a mosaic of badly interconnected national systems. " Language barriers remain a problem, requiring crew changes at some borders. Switching systems and signals differ.

And efficiency is more of a dream than a goal. Europe’s railroads still have to deal with "phantom trains" that run so late that they combine with others and disappear from the railroad’s records. In an era when many companies depend on a "just-in-time" inventories to make a profit, railroads are rarely on time at all.

Yet there is little official enthusiasm for changing the system. The reality is that governments have helped create the imbalance between road and rail in Europe—and government action will likely be needed to fix it. The French emphasis on using rail to move people instead of goods, for instance, has helped cripple freight service. "All the investments went to passenger traffic," says Denis Douté, director of freight services for the French rail company SNCF. Freight trains have had to find "windows" to run in between passenger trains, unlike those in the United States, which often travel on separate tracks. The further development of the freight network requires massive investments to modernize existing infrastructure and open new ones. However, the political will to fund that kind of investment is lacking, which means the citizens will have to hold their noses for a while longer.

From the second paragraph, we can infer that the major reason for the road hazards is that ().

A. the Global Positioning System is not advanced enough

B. the volume of freight traffic on the roads is too heavy

C. the bigger truckers are not so flexible and efficient

D. the trucks and tunnels are too heavily loaded

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