logo - 刷刷题
下载APP
【单选题】

A.A
B.B
C.C
D.D

A.
设随机变量X,Y,Z相互独立,且X~N(1,2),y~N(2,2),Z~N(3,2),如果()
B.
举报
参考答案:
参考解析:
.
刷刷题刷刷变学霸
举一反三

【单选题】Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. (10 points)11() A.thing B.material C.atmosphere D.matter

A.
Air is (1) , and like all matter, it has weight. Weight is the measure of the (2) of gravity (3) matter. If a scale registers 10 kilograms when a stone is placed on it, this means that gravity pulls the stone with that (4) force. (5) , earth’ s gravity pulls on each (6) of gas and dust on the atmosphere. Because our atmosphere is a. vast (7) of air, it has (8) . If it could (9) be compressed and put on a (10) of scales, it would weigh about 5,700,000,000,000,000 (quadrillion) metric tons.
B.
The air pressed down on us and against us (11) all sides. Something (12) a ton of air is pressing against you at this moment. You are not (13) of this because air pressure within your body (14) the pressure of the air outside.
C.
Air pressure is 1. 036 kilograms per square centimeter (14.7 pounds per square inch) at sea (15) . It is greatest there because that is the (16) of the atmosphere. (17) higher altitudes the pressure is (18) . That is why the (19) of highflying planes are pressurized. They are designed to (20) the air pressure our bodies must have.

【单选题】知柏地黄丸治疗尿路感染的治法是

A.
疏肝理气,清热通淋
B.
益气健脾,利湿通淋
C.
滋阴益肾,清热通淋
D.
清热利湿,利尿通淋
E.
清心泻火,利湿通淋

【单选题】甲国和乙国合并成立丙国,下列选项中哪一项属于丙国政府应该继承的债务( )

A.
甲国西方企业向丁国政府所贷款项
B.
甲国政府关于甲国南方省水利项目向丁国政府所贷款项
C.
乙国北方省政府向丁国政府所贷款项
D.
乙国东方公司向丁国政府所贷款项

【单选题】What contribution does the author feel people must now make() A.Search for new energy sources. B.Outlaw motor transportation. C.Accept a new lifestyle. D.Adopt a new form of government.

A.
Text 1
B.
The energy crisis, which is being felt around the world, has dramatized how the careless use of the earth’ s resources has brought the whole world to the brink of disaster. Tile over development of motor transport, with its increase of more cars, more highways, more pollution, more suburbs, more commuting, has contributed to the near destruction of our cities, the breakup of the family, and the pollution not only of local air but also of the earth’ s atmosphere. The disaster has arrived in the form of the energy crisis.
C.
Our present situation is unlike war, revolution or depression. It is also unlike the great natural disasters of the past. Worldwide re sources exploitation and energy use have brought us to a state where long - range .planning is essential. What we need is not a continuation of our present serious slate, which endangers the future of our country, our children, and our earth, but a movement forward to a new norm in order to work rapidly and effectively on planetary problems.
D.
This country has been falling back under the continuing exposures of loss morality and the revelation that lawbreaking has reached into the highest places in the bad. There is a strong demand for moral revival and for some devotion that is vast enough and yet personal enough to enlist, the devotion of all. In the past 5t has been only in a way in defense of their own country and their own ideals that any people have been able to devote themselves wholeheartedly.
E.
This is the first time that we have been asked to defend ourselves and what we hold dear in cooperation with all the other inhabitants of this planet who share with us the same endangered air and the same endangered oceans. There is a common need it reassesses our present course, to change that courser and to devise new methods through which the world can survive. This is a priceless opportunity.
F.
To grasp item we need a widespread understanding of nature if the crisis confronting us--and’ the world--a crisis that is no passing in convenience, no by - product of the ambitions of the oil - producing countries, no environmentalists’ mere fears, no by - product of any present system of government. What we face is the outcome of the invention of the last four hundred years. What we need is a transformed lifestyle. This new lifestyle can flow directly from science and technology, but its acceptance depends on a sincere devotion to finding a higher quality of life for the world’ s children and future generation.