【简答题】编程:用for语句,求1~n的累加和,其中n为大于或者等于0的整数,输入n的值,计算1~n的累加和并输出。
【简答题】荆州花鼓戏的声腔主要来自___、___和___,具有突出的民俗特点和歌唱性特色。
【单选题】In order to keep the oil film on the cylinder liner during the running-in period, the piston rings are slightly rounded .
A.
on both the external and internal top edges
B.
on both the external top and bottom edges
C.
on both the external and internal bottom edges
【简答题】下面的函数是完成1~n的累加,请填空。a(int k){ if(k <=0) printf('error\n') if(k==1) return 1 else}
【简答题】下面的函数是完成1~n的累加,完成函数。 a(int k) {if(k<=0)printf('error\n') if(k==1) 【18】 else 【19】 }
【简答题】已知a 1 =b 1 =1,a n+1 =b n +n,b n+1 =a n +(-1) n ,n∈N*, (Ⅰ)求a 3 ,a 5 的值; (Ⅱ)求通项公式a n ; (Ⅲ)求: ; (Ⅳ)求证: 。
【单选题】The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving _____.