均衡点的特性,包括()。
A.周期性
B.客观性
C.存在性
D.稳定性
E.唯一性
参考答案:C, D, E
Lynn said she _________ a pen.[ ]
A. buy
B. bought
C. buys
D. buying
下面程序的输出结果是______。#inc1ude<stdio.h>main() char*p[]="BOOL","OPK","H","SP"; int i; for(i=3;i>=0;i-,i-) prinf("%c",*p[i]); print("\n")
A.SO
B.SP
C.SPOPK
D.SHOB