有一个具有10万行数据的关系表，每行占用2000B空间，如果在SQL -我要搜题网

[单选题]以下关于移井架作业的说法错误的是()
A.清除(拆开)所有妨碍井架移动的障碍(管线);固定钻台及井架上活动的物件;
B.移井架时可以没有专人指挥。
C.保持液压动力源、液压千斤顶等液压系统处于正常工作状态;

[填空题]天然气管道阴极保护可分为( )两种。

[简答题]简述自己创造观察指标是具体注意事项？

[单选题]Text 1 Giant corporations often claim to be"green,"pointing to programs they've undertaken aimed at being environmentally conscious.But sometimes these efforts don't really amount to much.They can be no more than'igrcenwashing,"a public relations effort that doesn't represent any fundamental shift in thinking.But such a change may actually be going on among several of the world's largest fossil fuel companies,namcs such as ExxonMobil,Shell,and BP.One of the biggest reasons:pressure from the companies'sharcholdcrs.Investors arc asking corporations to make more transparent the effects climate change will have on their businesses,as well as explain what they are doing to reduce their greenhouse gas emissions.While sharcholdcr motivcs are cerlainly aimed at helping in the worldwide fight against global warming,they also represent a practical need to better understand a company's prospects.If the burning of oil and gas is grcaily curtailed as a result of the December 2015 intemational Paris climate agreement,for example,how might that affect the bottom line of a corporation whose chief source of revenue is extracting and selling carbon-emitting oil and gas?Or,conversely,how is a company planning to take advantage of the business opportunities that emerge from a shift away from fossil fuels?Climate Action 100+,for example,is a shareholder action group that is asking corporations to make stronger commitments to meeting the 80 percent cut in carbon emissions proposed by the Paris agreement signed two years ago by nearly 200 nations.Some 225 investment groups who manage more than S26.3 trillion have signed on in support.Last week,intemational energy giant ExxonMobil said it will step up its reporting to shareholders and the public about the impacts climate change will have on its business,including any expected increased risks.The new policy follows a vote by ExxonMobil investors at the company's annual meeting in May that called for a yearly assessment of the effects of climate change on the company.The new position represents a sea change for ExxonMobil,which until the early 2000s had disputed the need to take action on climate change.Around the world national govemments are shaping new policies in an effort to reduce greenhouse gas emissions to a level that will not allow global temperatures to rise more than 2 degrees Celsius.In the U,S.,individual states and cities are pursuing lawsuits against companies that fail to deal responsibly with greenhouse gas emissions,which they contend harm the public.22.Which of the following is right about shareholders?
A.They explained their steps to reduce greenhouse gas emissions.
B.They are reluctant to help fight against global warming.
C.They have made some corporations'thought changed.
D.They pointed out their understanding of companies'prospects.

[单项选择]有一个具有10万行数据的关系表，每行占用2000B空间，如果在SQL Server 2000管理的数据库中存放此关系表，则需要的空间大约是（）。A. 300 MBB. 400 MBC. 500 MBD. 600 MB

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[单项选择]有一个具有10万行数据的关系表，每行占用2000B空间，如果在SQL Server 2000管理的数据库中存放此关系表，则需要的空间大约是（）。
A. 300 MB
B. 400 MB
C. 500 MB
D. 600 MB