下列选项中,可能发生爆炸的粉尘的最小浓度有误的是( )。A.各种煤尘为30~40g

题型:单项选择题

问题:

下列选项中,可能发生爆炸的粉尘的最小浓度有误的是( )。

A.各种煤尘为30~40g/m3
B.淀粉为9g/m2
C.糖为10.3g/m3
D.铝及硫磺为7g/m3

考点:安全工程师安全生产技术安全生产技术
题型:单项选择题

扑尔敏抗过敏的原理是

A.稳定肥大细胞
B.促IgE合成转变为IgG合成
C.灭活组胺
D.拮抗组胺
E.松弛平滑肌

题型:单项选择题

        小红的父亲开家长会时,看到七年级(1)班的“成绩排名榜”上,小红的成绩居第38名。父亲对小红的前途失去信心,回家后,父亲将小红毒打了一顿,然后强迫她辍学到沿海去打工。深圳某皮鞋厂安排14岁的小红做了学徒工。

        以上材料中的现象和行为违反了未成年人保护法的哪些规定?说明你的理由。

_____________________________________________________________________ 

题型:单项选择题

根据《票据法》的规定,如果本票的持票人未在法定付款提示期限内提示见票的,则丧失对特定票据债务人以外的其他债务人的追索权。该特定票据债务人是( )。

A.出票人

B.保证人

C.背书人

D.被背书人

题型:单项选择题

某省甲县的行政隶属关系由原地区划归乙市管辖后,该县利用乙市优惠政策吸引了大批外资,经济迅速发展,从而带动了地价的上涨,这属于______。

A.行政隶属变更带来的地价上升
B.房地产投机引起的地价变动
C.储蓄水平的增长带来的地价上升
D.国家金融体制的变化引起的地价变动

题型:单项选择题

Although no longer slavers after the Civil War, American blacks took no significant part in the life of white America except as servants or laborers. Many thousands of them emigrated from the war-ravaged South to the North from 1865 to 1915 in the hope of finding work in the big industrial cities. Whole communities of blacks crowded together into ghettos in New York City, Chicago and Detroit, where once the poor white immigrants had lived. These ghettos, neglected by the city authorities, became slums. The schools to which black children went were hopelessly inadequate. Unemployment in black ghettos remained consistently higher than in white communities.
41. Serious problems with black ghettos. ______
Stable family life was difficult to maintain.
42. The extreme poverty of the blacks. ______
In the late 1970s, nearly a third of all blacks still belonged to the so-called "underclass", they are so " under-privileged " and poor that they cannot seize the opportunity for advancement.
43. Efforts to put an end to racial discrimination. ______
Race relations in the USA continue to be a thorny problem.
44. Improvements in lives of the blacks. ______
Despite some setbacks, race relations are improving.
45. Prevailing violence in solving racial problems. ______
It is said that television had an enormous influence on frustrated and bitter blacks, for it showed them bow much better whites on the whole lived than blacks. At the end of the 1960s, there were serious riots in many cities.
The violence quickly died down. Blacks began to use their votes to exert political pressure. Cities like Atlanta (Georgia), Gary (Indiana), and Los Angeles (California) elected black mayors. Integration of schools, despite resistance from white groups, goes on, and the proportion of blacks in American colleges has increased dramatically in the last 20 years. There are reasons to maintain a cautious optimism that progress in race relations will continue.
[A] It has been estimated that there are more than 20 million Americans in this category, 10% of the population, including many millions of whites.
[B] Blacks are gaining in self-confidence. In more and more areas, they are winning control of their communities, and their standard of living is going up faster than that of the poor whites. It is still a hard struggle. There is still prejudice and even some hatred, but in most walks of American life there are now more blacks than ever before.
[C] The era of blatant discrimination ended in the 1960s through the courageous actions of thousands of blacks participating in peaceful marches and sitins, to force Southern states to implement the Federal desegregation laws in schools and public accommodations. Down came the " whites only" notices in bused, hotels, trains, restaurants, sporting events, restrooms and on park benches that once could be found everywhere throughout the South. Gone were the restrictions that prevented blacks voting. Gone, too, were the hideous lynchings, which since the Civil War had caused the death of thousands of innocent blacks-- hanged without trial by white mobs. However, even today, poor, uneducated lacks do not always receive the same degree of justice that the more affluent and better educated can expect.
[D] Many blacks chose to keep silent about their unfairness instead of resorting to violence. But their silence was also problem provoking: on the one hand, silence would build up a lot of complaints and hatred in their minds, thus resulting in a negative approach to life and everything; on the other hand, silence would give the whites an impression that the blacks take the reality for granted and put more racial discrimination on them.
[E] Unemployed fathers would on occasion walk out of their homes and never return. Children neglected by their parents turned in some instances to drugs and crimes. There are more than 700 murders a year in cities like New York, Detroit, Los Angeles and Houston, and most of these deaths are of blacks killed by blacks. The black ghettos are dangerous both for blacks and non-blacks.
[F] Radical blacks like the Black Panthers demanded a free black state within the Union, and advocated violence to achieve that end and to protect themselves against what they felt was police brutality toward blacks. For a while, violence overshadowed the influence of the greatly respected pacifist black, Martin Luther King, Jr. , who had provided the inspiration and leadership for those devoted to a peaceful change and whose murder in 1968 stunned America.

更多题库