利用冲击发生器做操作波试验时，影响波形的有哪些参数？

For some people, the light of human attention has an unbearable brilliance. Like ivy along the dim edge of a garden, they prefer the social shadows, shunning parties, publicity and fame of any sort. Then there are the flowers of the human arboretum. For them, being in the view of others seems necessary for life itself. From Hollywood to fabricated prime-time reality, this spotlight-dependent species is thriving.

But what about the individuals who crave attention for more desperate reasons Those who resort to unusual ways to get it Lately, it seems, a dark bloom of these characters has emerged. For motives known only to themselves, they have won notoriety by drawing on an almost sacred well of social status, victim hood.

In early April, US national news outlets tracked the disappearance of Audrey Seiler, a sophomore at the University of Wisconsin in Madison. Police and hundreds of concerned citizens searched for four days before Seiler was discovered. Seiler said she was kidnapped. Within hours, however, her story fell apart. Police announced that her abduction had been a hoax. Why would a popular student make herself disappear Her motive remains a mystery, but perhaps it had something to do with the search parties and the news bulletins that surrounded her.

Sympathy is a powerful sentiment that can connect complete strangers. But if it’s used to manipulate, the backlash can be much more intense.

In February, a Waterbury, Connecticut, man was arrested as a result of exploiting sympathy. Edward Valentin told reporters that he had received word that his wife, serving in Iraq, had been killed in an explosion. Police said Valentin admitted the fabrication, reasoning that if people felt sorry for him maybe the military would send his wife home. Evidence, however, points elsewhere.

In its extreme form, such a craving shows up in mental disorders, where sufferers may seek attention by causing themselves harm. But even when it comes with no diagnosis, a deep craving to be noticed can have a wide impact.

For these individuals, victim hood represents a "pure state of guilt-free entitlement," said psychologist Richard Levak, of Del Mar, California. "They go from being utterly deprived to being utterly indulged. In today’s world ... people have become more depressed and disconnected from each other. So you get people who crave affection and attention and approval. They don’t know how to ask for it and they don’t know how to get it. That leaves them vulnerable. " Levak said.

According to the first paragraph, some people ().

A. do not like to be in the spotlight

B. like the dark side of society

C. prefer the beauty of plants to people

D. avoid the media but enjoy parties

甲公司因转产致使一台价值1000万元的精密机床闲置，该公司董事长与乙公司签订了一份机床转让合同。合同约定，精密机床作价950万元，甲公司于10月31日前交货，乙公司在交货后10天内付清款项。在交货日前，甲公司发现乙公司的经营状况恶化，于是甲公司通知乙公司中止交货并要求乙公司提供担保，乙公司予以拒绝。又过了一个月，甲公司发现乙公司的经营状况继续恶化，于是提出解除合同。乙公司遂向法院起诉，要求甲公司交货。法院在审理中还查明，甲公司的机床原由丙公司保管，保管期限至10月31日，保管费为20万元。11月5日，甲公司将机床提走，并承诺10天内支付保管费，如果不付保管费，丙公司可以对该机床行使留置权。但甲公司后来并未支付保管费，现丙公司要求行使留置权。

丙公司______对该机床行使留置权。

A．有权依据当事人间的合同

B．有权依据《担保法》的规定

C．可以通过法院

D．不可以

水的电离平衡曲线如右图所示，下列说法不正确的是（　　）

A．若从A点到C点，可采用：温度不变在水中加入适量的NH₄Cl固体

B．若从A点到D点，可采用：温度不变在水中加入少量的酸

C．图中五点K_W间的关系：B＞C＞A=D=E

D．若处在B点时，将pH=2的硫酸与pH=10的KOH等体积混合后，溶液显中性

关于血红蛋白质叙述，下列哪项是错误的

A．血红蛋白是由4条珠蛋白肽链各结合1个血红素形成的四聚体

B．胎儿的血红蛋白主要成分为HbF，正常人出生后就完全不能检出

C．HbF较HbA抗碱性强

D．HbS为β链异常，见于镰形细胞性贫血

E．血红蛋白的分子量是64458

中碳钢是指碳的质量分数在（）范围之内的铁碳合金。

A.0.04%～0.25%

B.0.25%～0.6%

C.0.6%～1.5%

D.1.5%～2.0%