题目内容

Translate the sentence:I have no head for mathematics.

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Translate the sentence: We wouldn't have any idea when the boy was born.

1、平面汇交力系平衡的充分必要条件是力系的合力等于零。

A. 对
B. 错

有以下程序#include void fun(char a, char b){a=b;(a)++;}int main(){char c1='A',c2='a',p1,*p2;p1=&c1;p2=&c2;fun(p1,p2);printf("%c%c\n",c1,c2);return 0;}程序运行后的输出结果是________

Ab
B. ba
C. BB
D. bb

有以下程序#include int main(){printf("%d\n",NULL);return 0;}程序运行后的输出结果是_______

A. 0
B. 1
C. -1
D. NULL没定义，出错