Formanyyears,peopleelectricears.However,makingthemhasbeenmoredifficultthanpredicted.()A.haddreamedofB.havedreamedofC.dreamedofD.dreamof
For many years,people __ electric ears.However,making them has been more difficult than predicted.( )
A. had dreamed of
B. have dreamed of
C. dreamed of
D. dream of
For many years,people __ electric ears.However,making them has been more difficult than predicted.( )
A. had dreamed of
B. have dreamed of
C. dreamed of
D. dream of
1)已知f(x)是二次函数且f(0)=2,f(x+1)-f(x)=x-1,求f(x).(2)已知f 2020-05-13 …
用符号表示“点A在直线l上,l在平面a外”,正确的是().A.A属于l,l不属于a.B.A属于l, 2020-05-13 …
设服从二项分布B~(n,p)的随机变量ξ的期望和方差分别是2.4与1.44,则二项分布的参数n、p 2020-05-15 …
求函数f(x)=x^3+ax^2+bx+c,过曲线y=f(x)上的点P(1,f(1))的切线方程为 2020-05-15 …
数据结构的题目,对单链表中的元素按插入排序法排序的算法如下,其中L为链表头节点指针.请填空完成其功 2020-05-17 …
定义点P(x0,y0)到直线l:Ax+By+C=0(A2+B2≠0)的有向距离为d=Ax0+By0 2020-07-09 …
有一个力F,它在不断增大.某人以此为条件,应用P=Fv进行如下推导.根据P=Fv,F增大则P增大; 2020-07-20 …
下面是“经过已知直线外一点作这条直线的平行线”的尺规作图过程.已知:如图1,直线l和l外一点O.求 2020-07-26 …
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口算题7.它+它.u=0.7×16-16×0.它=6÷1.它=9.它÷它.3=它l÷l+16÷l=1 2020-12-13 …