1973 年，对以色列发动 "十月战争 "的埃及总统是 ()

设 f(0)=0 ,则 f(x) 在 x =0 处可导の充要条件为（）

如图， 正方体于半径为 3m 球内， 且一面位于球的大圆上， 则正方体的表面积最大为 （） 

Each year in the United States, many black teenagers _______ of school, either because they cannot keep up or they have to work to support their family.

The association is ________ to raising funds to help the blind.

设函数 f(x) 在x=0处连续，下列命题错误的是（）

Tom placed the bank notes ，_________the change and receipts ，back in the drawer ．

________，标志社会主义基本制度的确立。

下列对关于个体手工业改造错误的是 ___________。

Senior members of the staff competed eagerly ________ the position of sales manager in the company.