两级放大电路第一级的电压增益为48,第二级的电压增益为12,则两级总的电压增益为()

题型:单项选择题

问题:

两级放大电路第一级的电压增益为48,第二级的电压增益为12,则两级总的电压增益为()。

A、60

B、30

C、36

D、18

考点:仪表工考试工业自动化仪器仪表与装置装配工工业自动化仪器仪表与装置装配工题库
题型:单项选择题
一个骰子,六个面上的数字分别为1,2,3,4,5,6投掷一次,向上面为数字3的概率及向上面的数字大于3的概率分别是(  )
A.
1
2
1
6
B.
1
3
2
3
C.
1
4
1
2
D.
1
6
1
2
题型:单项选择题

用于诊断早期妊娠的是()

A.血雌二醇

B.尿雌三醇

C.血孕酮

D.睾酮

E.绒毛膜促性腺激素

题型:单项选择题

For many years it was common in the United States to associate Chinese Americans with restaurants and laundries. People did not realize that the Chinese had been driven into these occupations by the prejudice and discrimination that faced them in this country.
The first Chinese to reach the United States came during the California Gold Rush of 1849. Like most of the other people there, they had come to search for gold. However, either because the Chinese were so different from the others or because they worked so patiently that they sometimes succeeded in turning a seemingly worthless mining claim into a profitable one, they became their scapegoats of their envious competitors. Often they were prevented from making their claims; some localities even passed regulations forbidding them to own claims. The Chinese therefore started to seek out other ways of learning a living. Some of them began to do the laundry for the white miners; others set up small restaurants.
In the early 1860’s many more Chinese arrived in California. This time the men were imported as work crews to construct the first transcontinental railroad. They were needed because the work was so dangerous, and it was carried on in such a remote part of the country that the railroad company could not find other laborers for the job. As in the case of their predecessors, these Chinese were almost all males and like them too, they encountered a great deal of prejudice.
When times were hard, they were blamed for working for lower wages and taking jobs away from white men, who were in many cases recent immigrants themselves. Anti-Chinese riots broke out in several cities.
Most of today’s Chinese Americans are the descendants of some of the early miners and railroad workers. Those immigrants had come from the vicinity of Canton in southeast China, where they had been uneducated farm laborers. The same kind of young men, from the same area and from similar humble origins, migrated to Hawaii in those days. There they fared far better, mainly because they did not encounter hostility. Some married native Hawaiians, and others brought their wives and children over. They were not restricted to Chinatowns, and many of them soon became successful merchants and active participants in general community affairs.
The high regard for education which is deeply imbedded in Chinese culture, and the willingness to work hard to gain advancement, are other noteworthy characteristics of theirs. This explains why so many descendants of uneducated laborers have succeeded in becoming doctors, lawyers and other professionals.

The high regard for education is deeply imbedded in a Chinese culture. It is ______ in Chinese culture.

A.easily found

B.completely forgotten

C.something new

D.firmly fixed

题型:单项选择题

患者男性,30岁,咳嗽6d,畏寒,发热3d,咳铁锈色痰。听诊:右上肺闻及似抬舌后经口腔呼气时所发出的“ha”音响,调高,吸气时相较呼气时相短。

该患者发热的热型最可能是

A.稽留热

B.弛张热

C.间歇热

D.回归热

E.波状热

题型:单项选择题

对于征收的集体土地,其土地所有权属于国家,用地单位只有土地使用权。( )

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