摩擦性失业与劳动力供求状态相关，与市场制度本身无关。（）
参考答案：错
Johnson, to grasp the chance to become a doctor,decided to take up teaching.[ ]
A. fail
B. failed
C. to fail
D. having failed
以下程序的执行结果是 ______。 #include＜iostream.h＞ void main() int a=o,b=1,c=0,d=20； if (
