某手表厂机械手表产品中的一个齿轮外径设计尺寸为3.1mm，生产过程中所允许的误差为（+0.0015，-0.0020）。某道工序承担并完成齿轮外径的加工，现在需要通过随机抽样对该工序的工序能力进行评估，抽取了250个样品，经测算，样本平均值和公差中心重合.s=0.00049。根据以上资料，回答下列问题：

若需在某道工序中控制该齿轮材料的强度，则要求控制该工序的( )。

A:双侧公差 B:公差中心 C:上限公差 D:下限公差

　核酸探针指由人工标有特定标志物的单链核酸（DNA或RNA）片段，它能以碱基配对互补的方式与具有对应碱基序列的单链核酸结合，用来检测样品中的核酸与探针是否具有同源性,以及同源片段的大小。

关于寡核苷酸探针，叙述正确的是

A:序列短，对碱基组成和探针结构要求不高 B:杂交时间长，杂交信号强 C:灵敏性和特异性都很高 D:可以用于点突变的检测 E:制备方法复杂，价格较高

“Representative samples were drawn at random from the above-mentioned goods and were inspected with the results as follows”，最确切的翻译是( )。

A:从上述货物中抽取代表性样品，经检验结果如下 B:从上述货物中任意抽取样品，经检验结果如下 C:从上述货物中抽取样品，经检验结果 D:从上述货物中任意抽取代表性样品，经检验结果如下

“Representative samples were drawn at random from the above—mentioned goods and were inspected with the results as fellows：”最确切的翻译是（）

A:从上述货物中抽取代表性样品，经检验结果如下： B:从上述货物中任意抽取样品，经检验结果如下： C:从上述货物中抽取样品，经检验结果： D:从上述货物中任意抽取代表性样品，经检验结果如下：

“Representative samples were drawn at random from the above-mentioned goods and were inspected with the results as fellows：”最确切的翻译是( )

A:从上述货物中抽取代表性样品，经检验结果如下： B:从上述货物中任意抽取样品，经检验结果如下： C:从上述货物中抽取样品，经检验结果： D:从上述货物中任意抽取代表性样品，经检验结果如下：

“Representative samples were drawn at random from the aboved mentioned goods and were inspected with the results as follows”，最确切的翻译是( )。

A:从上述货物中抽取代表性样品，经检验结果如下 B:从上述货物中任意抽取样品，经检验结果如下 C:从上述货物中抽取样品，经检验结果 D:从上述货物中任意抽取代表性样品，经检验结果如下

“Representative samples were drawn at random from the aboved mentioned goods and were inspected with the results as follows”，最确切的翻译是( )。

A:从上述货物中抽取代表性样品，经检验结果如下 B:从上述货物中任意抽取样品，经检验结果如下 C:从上述货物中抽取样品，经检验结果 D:从上述货物中任意抽取代表性样品，经检验结果如下

“Representative samples were drawn at random from the above-mentioned goods and were inspected with the results as follows”，最确切的翻译是( )。

A:从上述货物中抽取代表性样品，经检验结果如下 B:从上述货物中任意抽取样品，经检验结果如下 C:从上述货物中抽取样品，经检验结果 D:从上述货物中任意抽取代表性样品，经检验结果如下