题目：
重组DNA技术里的分子克隆是指（）
A.细菌克隆
B.DNA克隆
C.RNA克隆
D.动物克隆
E.植物克隆
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：The standard error of the sample mean is estimated by dividing the standard deviation of the sample by the square root of the sample size. The standard deviation of the sample is calculated by taking the positive square root of the sample variance
