已知关于x的方程kx2+2x-1=0有两个不相等的实数根x1，x2，且满足（x1

所有醌类化合物均可反应的是( )

A．Borntrager’s反应
B．Kesting-Craven反应
C．Feigl反应
D．金属离子反应
E．无色亚甲蓝显色试验

高清的电影画面宽高比是（）。

A.352*288

B.640*480

C.1920*1080

D.720*576

19世纪后期文学的基本特征？

契税的纳税义务人是在我国境内转让土地、房屋权属的单位和个人。 ( )

When butterfat was considered nutritious and healthful, a law was enacted requiring that manufacturers use the term "imitation butter" to indicate butter whose butterfat content had been diminished through the addition of water. Today, it is known that the high cholesterol content of butterfat makes it harmful to human health. Since the public should be encouraged to eat foods with lower rather than higher butterfat content and since the term "imitation" with its connotations of falsity deters many people from purchasing products so designated, manufacturers who wish to give reduced-butterfat butter the more appealing name of "lite butter" should be allowed to do so.
Which one of the following, if true, most seriously undermines the argument

A．The manufacturers who prefer to use the word "lite" instead of "imitation" are motivated principally by the financial interest of their stockholders.

B．The manufacturers who wish to call their product "fire butter" plan to change the composition of the product so that it contains more water than it now does.

C．Some individuals who need to reduce their intake of cholesterol are not deterred from using the reduced-butterfat product by the negative connotations of the term "imitation."

D．Cholesterol is only one of many factors that contribute to the types of health problems with which the consumption of excessive amounts of cholesterol is often associated.

E．(E) Most people deterred from eating "imitation butter" because of its name choose alternatives with a lower butterfat content than this product has.