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【单选题】
第一台电子数字计算机是1946年在美国研制成功的，该机的英文缩写名是_______。A.
ENIAC
B.
MARK
C.
EDSAC
D.
EDVAC
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举一反三
【单选题】设 与 均为可微函数,且 。已知 是 在约束条件 下的一个极值点。下列选项正确的是( )(课后9-8,EX2)
A.
若 ，则
B.
若 ，则
C.
若 ，则
D.
若 ，则
【单选题】设f(x，y)与φ(x，y)均为可微函数，且φˊ(x，y)≠0，已知(xo，yo)是f(x，y)在约束条件φ(x，y)＝0下的一个极值点，下列选项正确的是( )．
A.
若fˊx(x，yo)＝0，则fˊy(xo，yo)＝0
B.
若fˊx(xo，yo)=0，则fˊy(xo，yo)≠0
C.
若fˊx(xo，yo)≠0，则fˊy(xo，yo)＝0
D.
若fˊx(xo，yo)≠0，则fˊy(xo，yo)≠0
【简答题】It is sad that there are so many people trapped in a storm with their credit cards. What’s worse, they are paying huge interest rates. It’s a pity that so many people are saving money but when they us...
【单选题】The reason _____ so many people are crazy about Gangnum Style is _____ it’s good for bodybuilding, and it brings people a lot of fun.
A.
/; that
B.
that; because
C.
why; because
D.
why; that
【单选题】设f(x，y)与ψ(x，y)均为可微函数，且ψ(x，y)≠0．已知(x0，y0)是f(x，y)在约束条件ψ(x，y)＝0下的一个极值点，下列选项正确的是
A.
若f'x(x0，y0)＝0，则f'y(x0，y0)＝0．
B.
若f'x(x0，y0)＝0，则f'y(x0，y0)≠0．
C.
若f'x(x0，y0)≠0，则f'y(x0，y0)一0．
D.
若f'x∥(x0，y0)≠0，则f'y(x0，y0)≠0．
【单选题】The election will be brought_____to June as so many people are on holiday in July.
A.
in
B.
off
C.
up
D.
forward
【单选题】听力原文：M: Today so many people are talking about AIDS. Is the AIDS epidemic very serious now? W: Oh, yeah. To say the impact on our society, this disease will be the most serious public-health problem w...
A.
The epidemic of AIDS.
B.
The treatment of AIDS.
C.
The transmission of AIDS.
D.
The impact of AIDS.
【单选题】设【图片】,【图片】均为可微函数，且【图片】，已知【图片】是【图片】在约束条件【图片】下的一个极值点，下列选项正确的是（ ）
A.
若 ，则
B.
若 ，则
C.
若 ，则
D.
若 ，则
【判断题】So many people are afraid of failure because no one tells us how to fail so that failure becomes a growing experience.
A.
正确
B.
错误
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