下列( )内容是异常的含义。
A．程序的语法错
B．程序编译或运行中所发生的异常事件
C．程序预先定义好的异常事件
D．程序编译错误
参考答案：B
Which of the following statements is generally not true regarding an investment in gold（）
A. Gold has typically experienced a low correlation with stock markets.
B. Gold has normally high liquidity.
C. Gold traditionally has provided a high expected return.
较高的（）对加氢反应有利。
A、己水浓度
B、催化剂浓度
C、温度
D、压力
