某出租写字楼的完全产权价值为2000万元，出租 * * 益价值为1600万元，则承租 * * 益

出血坏死型胰腺炎时的Cullen征是指( )

A．脐周皮肤红斑

B．脐周皮肤青紫

C．胁腹皮肤青紫

D．脐周皮肤呈灰紫斑色

E．胁腹皮肤呈灰紫斑色

单向链表的每一个结点都有一个指向它的后续结点的指针link，现有结点p和q，要将q插入结点p的后面，正确的操作应该是( )。

A．q↑．link:=p↑．link;p↑．link:=q；

B．q：=p↑．link；p↑．link：=q↑.link；

C．q↑．link：=p；p↑.link：=q；

D．q：=P↑．link；p：=q↑link；

Plants, like animals, are subject to diseases of various kinds．It has been estimated that some 30,000 different diseases attack our economic plants; forty are known to attack corn, and about as many attack wheat．The results of unchecked plant disease are all too obvious in countries which have marginal food supplies．The problem will soon be more widespread as the population of the world increases at its frightening rate．Even in countries which are now amply fed by their agricultural products there could soon be the major crops; the resulting famines(饥荒) could kill millions of people, and the resulting hardship on other millions could cause political upheavals(动乱) disastrous to the order of the world．

Some plants have relative immunity to a great many diseases, while others have a susceptibility to them．A blight (萎菌病) may be but a local infection easily controlled; on the other hand it can attack particular plants in a whole region or nation．An example is the blight which killed virtually every chestnut tree in North America．Another is the famous potato blight in Ireland in the last century．As a result of that, it was estimated that one million people died of starvation and related ailments．

Plant pathologists have made remarkable strides in identifying the pathogens of the various diseases．Bacteria may invade a plant through an infestation of insect parasites carrying the pathogen．A plant can also be inoculated by man．Other diseases might be caused by fungus which attacks the plant in the form of a model or smut or rust．Frequently such a primary infection will weaken the plant so that a secondary infection may result form its lack of tolerance．The symptoms(症状) shown may cause an error in diagnosis, so that treatment may be directed toward bacteria(细菌) which could be the result of a susceptibility caused by a primary virus infection．

小题1:How many diseases are known to attack wheat?

A．Around 30000

B．Forty

C．Around 29960

D．Around 40小题2:Unchecked plant disease won't result in_______．

A．food shortages in poor country

B．food shortages in rich country

C．increase of world population

D．disaster in world politics小题3:What is the main idea of the second paragraph?

A．Some plants have relative immunity to a great many diseases．

B．Some other plants have a susceptibility to a great many diseases．

C．The tolerance of a particular plant changes as the growing conditions change．

D．A blight can be a national infection．小题4:According to the passage, some plant diseases can__________．

A．infect people

B．be prevented by inoculation（接种疫苗）

C．be prevented by killing insects

D．be prevented by improving the growing conditions小题5:Which of the following won’t cause plant disease ?   

A．Fungus

B．Mold

C．Smut

D．Rust

maya第一个版本是哪个公司出品的（）

A.alias\wavefront

B.adobe

C.avid

D.autodesk

某数据库中有员工关系E(员工号，姓名，部门，职称，月薪)；产品关系P(产品号，产品名称，型号，尺寸，颜色)；仓库关系W(仓库号，仓库名称，地址，负责人)；库存关系I(仓库号，产品号，产品数量)。若需要得到每种产品的名称和该产品的总库存量，则对应的查询语句如下。
SELELCT 产品名称,SUM(产品数量)
FROM P,I
WHERE P.产品号=I.产品号______;

A．ORDER BY 产品名称
B．ORDER BY 产品数量
C．GROUP BY 产品名称
D．GROUP BY 产品数量