Janelle cut a board 30 feet long into 2 pieces. The ratio of the lengths of the 2 pieces is 2:3. What is the length,to the nearest foot, of the shorter piece?
【单选题】下列程序有多处错误,选项中解释错有 #include sbit LED = P1.0; void delay( void ) { int i = 50000 ; while (i > 0 ) i--; } int main( void ) { while ( 1 ) ( LED = 1 ; delay(); LED = 0 ; delay(); ) }