[单选题]( )是一套按被仿真的实际电力系统的数学模型,模拟各种调度操作和故障后的系统工况为调控员提供一个逼真培训环境的计算机系统,以达到既不影响实际电力系统的运行而又培训调控员的目的。
A.安全分析系统;
B.调控员培训模拟系统;
C.事故分析系统;
D.调控员潮流系统。

Simpson The global financial crisis of 2008—2009 began in July 2007 when a loss of confide- nce by investors in the value of securitized mortgages in the United States resulted in a liquidity crisis that prompted a substantial injection of capital into financial markets by the United States Federal Reserve, Bank of England and the European Central Bank. The TED spread, an indicator of perceived credit risk in the general economy, spiked up in July 2007, remained volatil (反复无常的) for a year, then spiked even higher in September 2008, reaching a record 4.65% on October 10, 2008. Amy In September 2008, the crisis deepened, as stock markets worldwide crashed and en- tered a period of high volatility, and a considerable number of banks, mortgage lenders and insurance companies failed in the following weeks. For many months before September 2008, many business journals published commentaries warning about the financial stability and risk