什么是焊接应力和变形?如何防止焊接变形?如何矫正焊接变形?

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问题:

什么是焊接应力和变形?如何防止焊接变形?如何矫正焊接变形?

考点:火电电力职业技能鉴定考试变电一次安装工(高级技师)变电一次安装工(高级技师)题库
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现代人力资源管理的特色不包括()。

A.采取人本取向,贯彻员工是组织的宝贵财富这一主题

B.采取面向任务取向,强调让人适应工作

C.采取互惠取向,强调组织和员工之间的"共同利益"

D.采取权变取向,强调因人因时因境实施管理

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广东各地村委会换届选举工作在今年展开,这次还要推选村民组成村务监督委员会,监督村务公开、民主理财等制度的落实。在这些活动中,村民参与的是

A.民主选举

B.民主管理

C.民主监督

D.民主决策

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甲公司是一家棉纱生产企业,生产工艺在同等行业中处于中等水平,生产规模较小,但企业市场竞争水平较高,在某地区占有市场份额25%,居于行业先进地位。近几年来,棉纱生产行业市场竞争激烈,虽然公司通过技术改造和加强内部管理大幅度降低成本,通过产品质量监督提升了企业的市场竞争力,但也仅能保住已取得的市场份额,企业发展后劲不足。为谋求企业发展,公司决定扩大纱锭规模。公司有关部门通过对扩大企业规模的风险与获益能力进行深入细致的分析研究后,提交了四种方案及相应损益值如下表。在总经理办公会上,公司决策层、生产与技术部门及市场营销部门在扩大纱锭规模的实施方案上争论激烈,最后在讨论的基础上,总经理确定了方案。
决策方案损益值自然状态销路好小路差
甲方案3500-900
乙方案25001000
丙方案2000-450
丁方案500300


根据以上资料,回答下列问题:

该公司总经理选定的实施扩大纱锭规模方案最优可能是( )。

A.甲方案

B.乙方案

C.丙方案

D.丁方案

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放线菌素D对肿瘤细胞的作用是()

A.干扰核酸生物合成(抗代谢)

B.破坏DNA结构和功能

C.嵌入DNA干扰核酸合成

D.干扰蛋白质合成

E.影响激素功能

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A conventional teacher’s licensee usually requires a university degree in education plus an unpaid term of practice teaching. This has never made much sense. It excludes bright students who take degrees in other subjects, and might teach those subjects; it is costly and time-consuming for career-switchers, who must wait a year or more before they can enter a classroom; it is so rigid that private-school teachers or university professors with years of experience have to jump through hoops before they can start teaching in a state school. And there is virtually no evidence that it creates better teachers. For all that, it is ply backed by schools of education, which have a monopoly of teacher-training, and by teachers’ unions, whose members make more money when it is artificially hard for others to get into the profession.

Now, some 45 states and the Districts of Columbia offer an "alternative route" to a teacher’s licensee, up from only a handful in the 1980s. Alternative certification (AC) generally allows individuals with a university degree to begin teaching immediately after passing an entrance examination. These recruits, watched over by a mentor teach the subject they studied at university, and take education courses at a sponsoring university while drawing their salaries.

The traditional sort of American teacher is likely to be young, white and female. Alternative certification attracts more men and more non-whites. In Texas, for instance, roughly 90% of public-school teachers are white, but 40% of those who have joined through alternative certification are non-whites. The AC route also draws teachers willing to go where they are most needed. A survey of Troops to Teachers, a program that turns exsoldiers into public-school teachers (" Proud to serve again"), found that 39% of those taking part are willing to teach in inner-city schools, and 68% in rural areas.

Are they good teachers Officialdom is reluctant to release the details which might answer that question for certain. But anecdotal evidence suggests they do well. In New Jersey, which has been running this sort of program since 1984, rich districts, which can afford to be choosy, consistently hire more AC teachers than poor districts do. In Houston, Texas, where the Teach of America program (TFA) puts recent university graduates into poor communities as teachers, the most effective teachers are generally the TFA ones. " School principals are our biggest fans," Wendy Kopp, TFA’s president, says proudly.

So why not scrap the cumbersome teacher-licensing laws Frederick Hess, a professor at the University of Virginia, has written a paper for the Progressive Policy Institute arguing that teacher-licensing ought to be stripped to the bare essentials. Prospective teachers should be required only to hold a college degree, pass a test of essential skills, and be checked to make sure they do not have a criminal background. Other training is important, argues Mr. Hess, but the market, not state legislators, should decide what that training looks like. This notion of "competitive certification" has drawn favorable attention from the Bush administration.

What does the author suggest when he calls for "competitive certification" ( Line 7—8, Para.5 ) ()

A.Simplify teacher-licencing

B.Operate education like a market

C.Scrap unified education standard

D.Make entry easy for prospective teachers

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