关于声音的产生和传播,下列说法正确的是 A.声音可以在空气中传播,但不能在水中传

题型:选择题

问题:

关于声音的产生和传播,下列说法正确的是

A.声音可以在空气中传播,但不能在水中传播

B.声音不能在固体中传播

C.正在发声的物体一定在振动

D.声音在真空中传播的速度是340m/s

考点:声音的传播声音的产生
题型:选择题

基本医疗权

A.医者对待患者应该一视同仁是尊重患者的
B.医生的干涉权是
C.疾病认知权是
D.医务人员随意泄露患者隐私违背了
E.监督医疗权是

题型:选择题

诊断感染性心内膜炎最有效的方法是()

A.免疫学检查

B.心电图检查

C.X线检查

D.血培养

E.常规生化检查

题型:选择题

Modern industrial society grants little status to old people. In fact, such a society has a system of built-in obsolescence. There is no formal system for continuing our education throughout our life in order to keep up with rapidly changing knowledge. When our education and job skills have grown obsolete, we are treated exactly like those who have never gained an education or job skills and are not encouraged or given the opportunity to begin anew.
As a society becomes more highly developed, the overall status of older people diminishes. Improved health technology creates a large pool of old people, who compete for jobs with the young. However, economic technology lowers the demand for workers and creates new jobs for which the skills of the aged are obsolete, forcing older people into retirement. At the same time, young people are being educated in the new technology and are keeping pace with rapid changes in knowledge. Finally, urbanization creates age-segregated neighborhoods. Because the old live on fixed incomes, they must often live in inferior housing. All these factors -- retirement, obsolete knowledge and skills, inferior standards of living -- lower the status of the aged in society.
A century ago, when one could expect to live only to 50 or so, the life span more or less coincided with the occupation and family cycle. But today the average life span allows for fifteen to twenty years of life after these cycles. It appears that our life span is outpacing our usefulness in society.

The high development of economic technology______.

A.makes job skills out of fashion

B.lowers the demand for workers

C.forces old people into retirement

D.creates new jobs for older people

题型:选择题

下列关于混合资本债券说法正确的有()。

A.混合资本债券一般期限较长,且可以公开或定向发行

B.无论何种发行方式,混合资本债券都要进行信用评级,且每年发布一次评价报告,每季度发布一次凭借跟踪

C.发行人按规定提前赎回混合资本债券的应提前5个工作日报中国人民银行备案

D.发行人延期支付的,应作为重大事项在年度财务报告中披露

题型:选择题

渣油中的()含量越大,则焦炭质量越好。

A.烷烃

B.环烷烃

C.芳香烃

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