窄带随机过程在示波器上的波形是一个()和相位缓慢变化的正弦波。

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问题:

窄带随机过程在示波器上的波形是一个()和相位缓慢变化的正弦波。

考点:电子与通信技术通信原理通信原理题库
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女孩,16个月,发热3天,体温38~38.5℃,呕吐2次,非喷射性胃内容物,大便2~3次,稀,无脓血,病来哭闹,多汗拒抱。昨天下午右下肢不能站立行走。体检:体温38.6℃,神志清,烦躁,前囟已闭,咽稍红,颈软,心脏无异常。两肺呼吸音略粗。腹软,腹壁反射存在,右下肢无肿胀,肌力Ⅱ级,膝及跟腱反射未引出,痛觉存在,克氏征、布氏征均阴性。

对患儿原发病的治疗是()

A.立即静脉输液

B.给肾上腺皮质激素

C.给大剂量维生素C

D.给20%的甘露醇

E.将患肢置于功能位,并使用促进神经肌肉传导的药物

题型:填空题

B

When I was a boy, my father told me that he could do anything he wanted to. Dad said that he wanted to be the first to develop color prints in our city. And so he did.

When I was 16,Dad looked closely at the violin I played and announced that he want to make one. He read about violinmaking,and then became a violinmaker at the age of 43. He bought the tools and materials,opened a small store and set Mom up as the shopkeeper,while he worked at a local company. He retired from the company 17 years later and continued to make violins and other instruments.

Dad often guessed why the Stradivarius violins sound so beautiful. Some experts claimed that it was the unique varnish(油漆)that gave those instruments their beautiful sound. Dad argued that chemists could analyze the varnish—if that were the answer.

One of Dad’s friends asked him once which kind of wood was used to make violins. When Dad explained that the top was made of spruce(云杉),his friend said that he had an old piece of spruce Dad might be interested in.

He worked for the next 12 months making a violin from the wood that his friend had given him. It proved to be a superior violin and it would become Dad’s masterpiece. He was convinced that the secret of the Stradivarius sound was in the wood itself.

Later,the instrument was stolen. Dad’s spirit was broken by the robbery, and he stopped making instruments. But he kept the music shop until he was 80 years old, selling guitars and violins.

My father has been gone for 14 years now. The violin has been missing for more than 25 years. Somewhere a musician is playing a late-20th-century violin with an excellent tone. The owner today may never understand why this ordinary-looking violin sounds so much like Stradivarius.    

45. The author mentions his father’s developing color prints____________.

A. to show that his father’s real interest was not in making violins

B. to prove that his father could do anything he wanted to

C. to give an example proving that his father was an inventor

D. to describe the real thing that made the author believe his father

46. What did the author's father think about Stradivarius violins?

A. The varnish was different from the others.

B. The way of making them was special.

C. The wood of the violins was special.

D. They could only be analyzed by chemists.

47. From the underlined sentence, we can learn that the author’s father________.

A. 1iked the violin very much

B. got crazy after this happened

C. 1ost interest in instruments

D. didn't want to become famous

48. We can infer from the last paragraph that the author __________ .

A. really hates the thief

B. misses his father a 1ot

C. really wants to play the violin

D. wonders who’s playing the violin now

题型:填空题

对哮喘最有诊断价值的肺部体征是()

A.肺部呼吸音粗糙或有不固定的干湿啰音

B.两肺底及脊柱两旁听到较固定的中细湿啰音

C.双肺闻及哮鸣音

D.双肺可闻及支气管管状呼吸音

E.双肺呼吸音减弱

题型:填空题

患者男,38岁,突发撕裂样胸背部痛伴大汗,心率100次/分,右上肢BP80/60mmHg,左上肢BP150/70mmHg,听诊颈部血管杂音,胸骨左缘3~4肋间叹气样舒张期杂音;心电图示窦性心律,Ⅱ、Ⅲ、aVF导联T波倒置;X线胸片示上纵隔稍宽,经服用硝酸甘油疼痛未缓解。最可能的诊断是()

A.急性心肌梗死

B.急性夹层动脉瘤

C.自发性气胸

D.不稳定心绞痛

E.主动脉窦瘤破裂

题型:填空题

走中国特色社会主义文化发展道路,是由多种因素共同决定的,它包括()

①我国的社会制度

②我国经济发展的自身规律

③人民群众的根本意愿

④党的性质宗旨

A.①②③

B.①③④

C.②③④

D.①②④

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