生物系统绝大部分属于黑箱问题,极少为灰箱问题,几乎没有白箱问题。其中只有输入和输出关

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问题:

生物系统绝大部分属于黑箱问题,极少为灰箱问题,几乎没有白箱问题。其中只有输入和输出关系的结构或过程一无所有的系统称为()。

考点:系统建模与仿真系统建模与仿真题库
题型:填空题

下列溶液中微粒浓度关系一定正确的是 [ ]

A.氨水与氯化铵的pH=7的混合溶液中:[Cl-]>[NH4+]

B.pH=2的一元弱酸和pH=12的一元强碱等体积混合,因生成的盐水解使溶液中c(OH-)> c(H+

C.0.1 mol·L-1的硫酸铵溶液中:c(NH4+)> c(SO42-)> c(H+

D.0.1 mol·L-1的硫化钠溶液中:c(OH-)= c(H+)+ c(HS-)+ c(H2S)

题型:填空题

前 * * 损伤多见于()

A.骑跨伤

B.枪弹、锐器伤

C.骨盆骨折

D.腰部撞击伤

E.盆腔手术或腹膜后手术

题型:填空题

Anyone who doubts that children are born with a healthy amount of ambition need spend only a few minutes with a baby eagerly learning to walk or a headp toddler starting to talk. No matter how many times the little ones stumble in their initial efforts, most keep on trying, determined to master their amazing new skill. It is only several years later, around the start of middle or junior high school, many psychologists and teachers agree, that a good number of kids seem to lose their natural drive to succeed and end up joining the ranks of underachievers. For the parents of such kids, whose own ambition is often inseparately tied to their children’s success, it can be a bewildering, painful experience. So it is no wonder some parents find themselves hoping that ambition can be taught like any other subject at school.

It’s not quite that simple. "Kids can be given the opportunities, but they can’t be forced. " says Jacquelynne Eccles, a psychology professor at the University of Michigan who led a study examining what motivated first-and seventh-graders in three school districts. Even so, a growing number of educators and psychologists do believe it is possible to unearth ambition in students who don’t seem to have much. They say that by instilling confidence, encouraging some risk taking, being accepting of failure and expanding the areas in which children may be successful, both parents and teachers can reignite that innate desire to achieve.

Dubbed Brainology, the unorthodox approach uses basic neuroscience to teach kids how the brain works and how it can continue to develop throughout life. The message is that everything is within the kids’ control, that their intelligence is malleable.

Some experts say our education system, with its p emphasis on testing and rigid separation of students into different levels of ability, also bears blame for the disappearance of drive in some kids. Some educators say it’s important to expose kids to a world beyond homework and tests, through volunteer work, sports, hobbies and other extracurricular activities. "The crux of the issue is that many students experience education as irrelevant to their life goals and ambitions. " says Michael Nakkula, a Harvard education professor who runs a Boston-area mentoring program called Project IF (Inventing the Future), which works to get low-income underachievers in touch with their aspirations. The key to getting kids to aim higher at school is to tell them the notion that classwork is irrelevant is not true, to show them how doing well at school can actually help them fulfill their dreams beyond it. Like any ambitious toddler, they need to understand that they have to learn to walk before they can run.

According to the passage, most educators believe that many kids ().

A. show a lack of academic ambition at birth

B. amaze their parents by acting like adults

C. become less ambitious as they grow up

D. get increasingly afraid of failing in school

题型:填空题

对反流性食管炎洛杉矶分类标准(LAclassificationsystem),根据内镜下食管病变的严重程度进行分级,中重度严重程度的是()级。

A.a

B.b

C.c

D.d

题型:填空题


某投资公司建造一幢办公楼,采用公开招标方式选择施工单位。招标文件要求:提交投标文件和投标保证金的截止时间为2003年5月30日。该投资公司于2003年3月6日发出招标公告,共有5家建筑施工单位参加了投标。第5家施工单位于2003年6月2日提交了投标保证金。开标会于2003年6月3日由该省建委主持。第4家施工单位在开标前向投资公司要求撤回投标文件和退还投标保证金。经过综合评选,最终确定第2家施工单位中标。投资公司(甲方)与中标单位(乙方)双方按规定签订了施工承包合同,合同约定开工日期为2003年8月16日。
[问题]

上述招标投标过程中,有哪些不妥之处请说明理由。

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