【单选题】The solitude of the sea had made him keenly __________ every sight, sound and touch.
【单选题】已知函数f(x)=x 3 -3x 2 +a,若f(x+1)为奇函数,则曲线y=f(x)在点(0,a)处的切线方程是 [ ]
【单选题】已知曲线y=f(x)在点(x,y)的切线斜率为 ,且过点(1,1),则此曲线方程是( )。
【单选题】The solitude of the sea had made him keenly __________ every sight, sound and touch.
【单选题】Which of the following expression is NOT a suitable description for the solitude and mysteriousness of Lucy in the “Lucy Poems”?
【简答题】设曲线方程为y=f(x),且已知f(2)=7,f'(2)=∞,请写出曲线在点x=2处的切线方程及法线方程.
【简答题】如图电路中,电流 I 的最大值为多少? R 为何值时,可在电阻 R 上获得最大功率?
【简答题】2) Later, in the solitude of his room, he heard the hesitating patter of rain on the roof
【简答题】在如图所示电路中,稳压管最大稳定电流 I Zmax =50mA,稳压值U Z =10V,I Zmin =5mA,则(1)当E=15V时,试求输出电压U O 的值 ;( 2)当E=45V时,试求U O 的值;( 3)要使稳压管能安全工作,E最大值为多少?要使电路具有良好的稳压作用,E最小值为多少?