在滴定过程中，指示剂发生颜色变化在转变点叫做（）。
参考答案：滴定终点
投资机会选择主要包括投资机会寻找和筛选两个步骤。( )
Since the early nineties, the trend in most businesses has been toward on-demand, always-available products and services that suit the customer's ______ rather than the company's.
A．benefit
B．availability
C．suitability
D．convenience
