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【简答题】
剪刀撑在脚手架中是承受()或()的作用,而杆件承拉或受压的大小主要是靠扣件的抗滑能力,所以在剪刀撑斜杆上扣件设置得越多其受力效果越好。
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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
A.
若 ,则
B.
若 ,则
C.
若 ,则
D.
若 ,则
【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
【单选题】设f(x,y)与ψ(x,y)均为可微函数,且ψˊy(x,y)≠0,已知(xo,yo)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fˊx(xo,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
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