题目内容 (请给出正确答案)
提问人:网友z*****n 发布时间:2022年4月5日 15:25
[ 多项选择题]

关于滑轮和滑轮组的说法中,正确的有()。

A.定滑轮既可以省力也可以改变用力方向

B.滑轮属于杠杆类简单机械

C.手拉葫芦也是一种滑轮组

D.动滑轮实质是个等臂杠杆

E.定滑轮实质是个动力臂为阻力臂二倍的杠杆

参考答案
十点题库官方参考答案 (由十点题库聘请的专业题库老师提供的解答)
更多“关于滑轮和滑轮组的说法中,正确的有()。”相关的问题
人身保险代理人与人身保险经纪人的区别?
点击查看答案
Text 4 It has been a wretched few weeks for America’s. celebrity bosses. AIG’s Maurice Greenberg has been dramatically ousted from the firm through which he dominated global insurance for decades. At Morgan Stanley a mutiny is forcing Philip Purcell, a boss used to getting his own way, into an increasingly desperate campaign to save his skin. At Boeing, Harry Stonecipher was called out of retirement to lead the scandal-hit firm and raise ethical standards, only to commit a lapse of his own, being sacked for sending e-mails to a lover who was also an employee. Carly Fiorina was the most powerful woman in corporate America until a few weeks ago, when Hewlett-Packard (HP) sacked her for poor performance. The fate of Bernie Ebbers is much grimmer. The once high-profile boss of WorldCom could well spend the rest of his life behind bars following his conviction last month on fraud charges. In different ways, each of these examples appears to point to the same welcome conclusion: that the imbalance in corporate power of the late 1990s, when many bosses were allowed to behave like absolute monarchs, has been corrected. Alas, appearances can be deceptive. While each of these recent tales of chief-executive woo is a sis of progress, none provides much evidence that the crisis in American corporate governance is yet over. In fact, each of these cases is an example of failed, not successful, governance. At the very least, the beards of both Morgan Stanley and HP were far too slow to address their bosses’ inadequacies. The record of the Boeing beard in picking chiefs prone to ethical lapses is too long to be dismissed as mere bad luck. The fall of Messrs Greenberg and Ebbers, meanwhile, highlights the growing role of government-and in particular, of criminal prosecutors in holding bosses to account: a development that is, at best, a mixed blessing. The Sarbanes-Oxley act, passed in haste following the Enron and WorldCom scandals, is imposing heavy costs on American companies; whether these are exceeded by any benefits is the subject of fierce debate and may not be known for years. Eliot Spitzer, New York’s attorney-general, is the leading advocate and practitioner of an energetic "law enforcement" approach. He may be right that the recent burst of punitive actions has been good for the economy, even if some of his own decisions have been open to question. Where he is undoubtedly right is in arguing that corporate America has done a lamentable job of governing itself. As he says in an article in the Wall Street Journal this week: "The hour cede among CEOs didn’t work. Board oversight didn’t work. Ser-regulation was a complete failure." AIG’s board, for example, did nothing about Mr Greenberg’s use of murky accounting, or the conflicts posed by his use of offshore vehicles, or his constant bullying of his critics let alone the firm’s alleged participation in bid-rigging--until Mr Spitzer threatened a criminal prosecution that might have destroyed the firm.
A.America’s bosses no longer have absolute powerB.the conviction of last month declares fraud chargesC.there is a crisis in American .corporate governanceD.the America’s celebrity bosses are deceptive
点击查看答案
对于恶性肿瘤的根治性手术的切除范围,最恰当的是()
A.手术中应尽可能扩大切除范围,以免复发
B.均应行根治性手术,清扫区域淋巴结
C.应根据肿瘤的大小来决定手术范围
D.应根据肿瘤的浸润深度来决定手术范围
E.应根据肿瘤的分期、类型和部位来决定手术范围
点击查看答案
万向节的功能是()。
点击查看答案
褥疮性溃疡发生的部位()
A . A.腭乳头
B . B.腭皱襞
C . C.腭小凹
D . D.舌系带
E . E.舌下肉阜
点击查看答案
反冲洗管路的作用主要是()
A.过滤
B.浇花
C.清污
D.消毒
点击查看答案
丙与戊结合形成的个体的性别是(),这对夫妇再生一个与此个体表现型相同孩子的概率是()
下图为一对夫妇的遗传分析图,其中白化病由基因a控制,色盲基因由b控制,图中与白化病和色盲无关的染色体省略,请回答:
点击查看答案
论证的基本方法是“摆事实,讲道理”。
点击查看答案
______ is regarded as the beginning of romanticism in the 18th-century Britain.A.Lyrical BalladsB.Songs of InnocenceC.Songs of ExperienceD.The Tiger
A.
A.Lyrical
B.Songs
C.Songs
D.The
点击查看答案
多色凹版印刷是湿式印刷。
A.对 B.错
点击查看答案
技师理论培训中,选择合适的()将对实现培训目标起着重要的作用。
A.培训方法
B.培训内容
C.培训对象
D.培训材料
点击查看答案
不属于医院感染的情况是()
A.入院48小时内发生的感染
B.本次感染与上次住院有关
C.在原有感染基础上出现新的感染
D.由于诊疗措施激活的潜在性感染
E.新生儿经母体产道时获得的感染
点击查看答案
要想创造独具特色的技术和别具一格的服务,企业必须实施()战略。
A.成本领先 
B.差别化 
C.专一化 
D.收缩
点击查看答案
女衬衫的腰节长按()。
A . A、制图规格
B . B、1/2衣长
C . C、1/2衣长+2CM
D . D、任意
点击查看答案
根据《中华人民共和国会计法》的规定,下列经济业务事项中,应当办理会计手续,进行会计核算的有______。
A.款项和有价证券的收付 B.财物的收发、增减和使用 C.财务成果的计算和处理 D.债权债务的发生和结算
点击查看答案
客服
TOP