题目：
In your project，you have identifed important risks，and planned appropriate responses to the risks．Some risks e.g. possibility of natural disasters has been documented and accepted in your risk management plan．If there are risks that remain after you have taken these steps，then such risks are called______．
A．unidentifiable risks
B．residual risks
C．secondary risks
D．accepted risks
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B解析： 本题考核点为系统选样法。系统选样首先计算选样间隔；其次确定选样起点；根据间隔顺序选取样本。
