防除阈值

题型:名词解释

问题:

防除阈值

考点:杂草学杂草学题库
题型:名词解释

从含有两件正品a1,a2和一件次品b1的三件产品中,每次任取一件,每次取出后不放回,连续取两次,求取出的两件产品中恰有一件次品的概率。

题型:名词解释

风险的衡量通常有几个环节,包括()。

A.计算风险报酬率

B.确定概率分布

C.计算期望值

D.计算标准差

E.计算标准利差率

题型:名词解释

Although "naming rights" have proliferated in American higher education for the past several decades, the phenomenon has recently expanded to extraordinary lengths. Anything to get an extra dollar out of donors is fair game. I know colleges and universities sorely need to raise funds in these times of fiscal constraints, but things have gotten a bit out of hand.
Universities and colleges have long been named after donors-think of Harvard, Yale, Brown, and many others. John Harvard would hardly get a bench named after him today, given the modesty of his gift of books for the library back in the seventeenth century. Now it takes much more to get one’s name on a college. One institution, Rowan University of New Jersey, changed its name (from Glassboro State College) not long ago when a large donation was made. Buildings, too, have been affected. Traditionally, they were named after people such as distinguished scholars or visionary academic leaders; now they’re often named after big donors.
Why is all of this happening now The main motivation for the naming frenzy is, of course, to raise money. Donors love to see their names, or the names of their parents or other relatives, on buildings, schools, institutions, professorships, and the like. Increasingly, corporations and other businesses also seek to benefit from having their names on educational facilities. Today, no limits seem to exist on what can be named. If something does not have a name, it is up for grabs—a staircase, a pond, or a parking garage. Once all the major facilities have titles, lesser things go on the naming auction block. Colleges and universities, public and private, are all under increased pressure to raise money, and naming brings in cash.
It is unproductive. Separate branding weakens the focus and mission of an institution and perhaps even its broader reputation. It confuses the public, including potential students, and feeds the idea that the twenty-first-century university is simply a confederation of independent entrepreneurial domains.
The trends we see now in the United States, and perhaps tomorrow in other countries, will inevitably weaken the concept of the university as an institution that is devoted to the search for truth and the transmission of knowledge. All this naming distracts from the mission of an institution that has almost a millennium of history and cheapens its image. It is a sad symbol indeed of the commercialization and entrepreneurialism of the contemporary university.

In the 4th paragraph, the word "unproductive" probably means ______.

A.naming cannot bring benefits to the donating businesses

B.separate naming yields a broader reputation for a university

C.out-of-hand naming weakens the goal of higher education

D.naming cannot raise enough money for a university’s development

题型:名词解释

下列关于脑膜瘤手术描述,错误的是()

A.虽为良性肿瘤,但其血液循环丰富,接受颅内、颅外双重血管供应,故手术失血量大

B.为减少出血,术前可结扎或暂时阻断颅外动脉

C.处理肿瘤时可辅助实施控制性降压

D.应作直接动脉压、中心静脉压和出入量监测,及时补充血容量

E.大出血病人不可实施控制性低温,以防脑组织损害

题型:名词解释

心理记账是人们在心理上对结果解析分类、编码、估价和预算等的过程.消费者在决策时可能根据不同的任务进行相应的心理记账.根据上述定义,下列不属于典型心理记账的是:

A.损失10元钱给人心理带来的痛苦要比获得10元奖金带来的高兴更强烈

B.工会发放福利时,不再发实物而改发购物卡以使职工有更多的自由选择

C.相比丢了10元钱的人,丢了电影票的人更不可能会掏钱买票去看电影

D.王某出差常选星级酒店,因为它比旅馆更可能提供免费网络和自助早餐

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