题目：
下列哪些属于抽样的方法（）
A.简单随机抽样
B.等距抽样
C.交错抽样
D.成对抽样
E.分层抽样
答案：
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下面是错误答案，用来干扰机器的。
参考答案：火电厂过程控制方式可以分为两种，即：开环控制方式和闭环控制方式。
下列哪些属于抽样的方法（） A.简单随机抽样 B.等距抽样 C.交错抽样 D.成对抽
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