以下属于债权证书的金融工具是( )。
A．股票
B．国库券
C．金融期货
D．互换
参考答案：B
Our computer ________ at nine this morning and we haven't been able to do anything. [ ]
A. has broken down
B. crashed
C. has gone wrong
D. was out of order
空调客车车厢内应配置消防锤，并标注“（）”标识。
