如图所示是一列横波在某一时刻的波形图,波沿x轴正向传播,波速是18m/s,则这列

题型:选择题

问题:

如图所示是一列横波在某一时刻的波形图,波沿x轴正向传播,波速是18m/s,则这列波(  )

A.波长是6m,频率是

1
3
Hz

B.波长是8m,频率是

4
9
Hz

C.波长是10m,频率是1.8Hz

D.波长是8m,频率是

4
9Hz

考点:波长、频率和波速
题型:选择题

高龄老人王阿婆在老伴去世后,经常被子女反锁在家,不让出门,社会工作者认为王阿婆遭遇的是( )老人的问题。

A.忽视

B.冷漠

C.疏于照顾

D.虐待

E.剥夺

题型:选择题

一患者涂抹某种化妆品后5~7天,没有出现不良反应,再次涂抹时局部出现红肿.水泡,病变边界不清,有灼热感,患处瘙痒。

引起化妆品不良反应的主要常见诱固有()。

A.患者具有过敏体质

B.使用方法错误

C.化妆品微生物超标

D.使用部位不对

E.化妆品含有过敏成分

F.使用次数不规范

题型:选择题

物体由于被举高而具有的能量叫______,用公式表示为Ep=______,物体从高处运动到低处,重力做______功,(填“正”或“负”),重力势能______,(填“增加”或“减小”);当物体由低处运动到高处时,重力做______功(填“正”或“负”),重力势能______.(填“增加”或“减小”).物体由于运动而具有的能量叫______,用公式表示为Ek=______.

题型:选择题

Of all the employed workers in the United States, 12.5 million are part of a temporary workforce. The United States Bureau of Labor Statistics counts 9.2 percent of workers as those who have______(1) they term "alternative employment arrangements." The government predicts that temporary staffing agencies______(2) experience growth of 49 percent by 2010. If numbers increase at the rate ______ (3), these companies will add 1.9 million new jobs by 2010. That’’s more than any______(4) industry.Temporary workers were the first ones to be affected by the recent economic recession, but they are______(5) to be the first to regain positions as the economy picks up and companies work to rebuild. Employers use temporary workers as a resource because_______(6) offer flexibility and come at a low cost. Many temporaries are categorized as "independent contractors" instead of employees,______(7) allows the employer to avoid______(8) certain taxes. Because they are not required to offer benefits to temporary workers, companies can save a great deal of money by hiring temps. Usually, temporary workers can qualify_______(9) benefits if they work for a staffing company for a certain length of time. Most temps, however, do not continue with one company long______(10) to qualify for them because they regard the position as a step on the ladder to a______(11) position later.According to Richard Wahlquist, president of the American Staffing Association, 75_______(12) of temporary workers hope for transition out of the temporary staffing category______(13) a period of time. Wahlquist finds that temporary workers spend about 11 weeks on various assignments before their______(14) out of the temporary workforce. Many use temporary positions to gain experience and skills______(15) they move on to better jobs. Wahlquist says that the temp workforce as a whole turns______(16) 400 percent each year.Tom Dilworth, research director at the Employment Policies Institute, explains______(17) some workers like having temporary jobs______(18) it affords them a great deal of elasticity with time and everything. Some temps only have a limited______(19) of time to work and temp agencies can help coordinate jobs to fit their schedules. Other sometimes-employees use temporary jobs to get an______(20) to a company from the inside, to get a foot in the door of a certain business or career._______(21) others take temporary positions in hopes their employers will change them over to permanent positions eventually.Nearly all the industries in the United States use temporary workers.______(22) to Tim Costello, coordinator of the North American Alliance for Fair Employment, the growth of temporary labor threatens______(23) job security of permanent workers who fear replacement, as well as the temps who are more accustomed to turnover. He predicts that there will continue to______(24) a gradual shift from permanent employees to contingent staffing, and that such a_____(25) in workplace demographics will "lead to lower wages, poorer working conditions, and more instability."

题型:选择题

权利的使用效果有赖于下属对权力拥有者的尊重和信任程度,这体现了权力的()

A.情景性

B.依赖性

C.不确定性

D.资源性

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