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【判断题】
热辐射就是辐射换热。
A.
正确
B.
错误
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举一反三
【单选题】He enjoyed living in the small town at first but the _______ soon wore off, and he began to miss city life.
A.
certainty
B.
productivity
C.
novelty
D.
morality
【简答题】已知函数f(x)=ax 3 +bx 2 +(b-a)x(a,b是不同时为零的常数),其导函数为f'(x). (1)当 a= 1 3 时,若不等式 f′(x)>- 1 3 对任意x∈R恒成立,求b的取值范围; (2)若函数f(x)为奇函数,且在x=1处的切线垂直于直线x+2y-3=0,关于x的方程 f(x)=- 1 4 t 在[-1,t](t>-1)上有且只有一个实数根,求实数t的取值范围.
【简答题】函数y=f(x)在区间(0,+∞)内可导,导函数f'(x)是减函数,且f′(x)>0。设x 0 ∈(0,+∞),y=kx+m是曲线y=f(x)在点(x 0 ,f(x 0 ))的切线方程,并设函数g(x)=kx+m。 (1)用x 0 、f(x 0 )、f′(x 0 )表示m; (2)证明:当x 0 ∈(0,+∞)时,g(x)≥f(x); (3)若关于x的不等式x 2 +1≥ax+b≥ 在 上恒成立,...
【简答题】He wasn’t sick. He wasn’t old. And he wasn’t losing. He had a very good final season and won his last in 2008. And then he walked away. Lloyd Carr was 62. That’s a few years earlier than retireme...
【简答题】函数y=f(x)在区间(0,+∞)内可导.导函数f ′ (x)是减函数,且f ′ (x)>0,x 0 ∈(0,+∞).g(x)=kx+m是y=f(x)在点(x 0 ,f(x 0 ))处的切线方程. (1)用x 0 ,f(x 0 ),f ′ (x 0 )表示m; (2)证明:当x∈(0,+∞)时,g(x)≥f(x); (3)若关于x的不等式 x 2 +1≥ax+b≥ 3 2 x 2 3 在(0,+∞...
【单选题】已知定义在R上的偶函数g(x)满足:当x≠0时,xg′(x)<0(其中g′(x)为函数g(x)的导函数);定义在R上的奇函数f(x)满足:f(x+2)=-f(x),在区间[0,1]上为单调递增函数,且函数y=f(x)在x=-5处的切线方程为y=-6.若关于x的不等式g[f(x)]≥g(a 2 -a+4)对x∈[6,10]恒成立,则a的取值范围是(  )
A.
-2≤a≤3
B.
a≤-1或a≥2
C.
-1≤a≤2
D.
a≤-2或a≥3
【简答题】阅读理解。 He wasn't sick. He wasn't old. And he wasn't losing. He had a very good final season and won his last in 2008. And then he walked away. Lloyd Carr was 62. That's a few years earlier than re...
【简答题】已知函数f(x)=x 3 +bx 2 +cx,其导函数y=f′(x)的图象经过点(1,0),(2,0),如图所示.则下列说法中不正确的编号是______.(写出所有不正确说法的编号) (1)当x= 3 2 时函数取得极小值; (2)f(x)有两个极值点; (3)c=6; (4)当x=1时函数取得极大值.
【单选题】He began to season the arid ______ in the Middle East.
A.
weather
B.
day
C.
conditon
D.
climate
【单选题】直到舞会开始他才出现。
A.
He didn’t appear until the dancing party began.
B.
He appeared until the dancing party began.
C.
He appeared, but the dancing party didn’t begin.
D.
He didn’t appear, but the dancing party began.
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