单项选择题下列程序段的for循环，其循环次数是（ ）main(){int i,k; k=0; for (i=0;i<=9&&k!=10;i++) { scanf( %d ,&k);printf( %d ,k);} return 0;}
单项选择题When the input voltage to this circuit is 0.25 V, the output voltage is _______
是否为极值点的函数是
