A:计划经济体制开始被打破
B:依法破产是国企改革的必由之路
C:私营经济冲击了国有经济
D:国企破产适应了市场经济的需要
You have been sitting on my hat and now it is badly out of______.( )
已知等差数列{an}的前n项和为Sn,且满足S33-S22=1,则数列{an}的公差是( )