有关交界痣，下列哪种说法是错误的( )A．交界痣是指痣细胞集中分布在表真皮的交界位

In "quick-response" manufacturing, the manufacturer receives electronic feedback directly from retailers about which models, patterns, or styles are selling, and in what quantities. This feedback triggers the manufacture of further batches to replenish stocks of articles that have been sold. The advantage for retailers is that they are freshly stocked with just those articles that are most likely to sell.
For quick-response manufacturing to work to the retailer’s advantage in the respect mentioned above, which of the following must be true

A．The cost per piece of manufacturing various articles in small batches exceeds the cost per piece of manufacturing large quantities of those articles.

B．The equipment necessary to provide the direct feedback is different from the equipment that supports conventional inventory control.

C．Consumers do not patronize a store that does not stock the model, pattern, or style that they prefer.

D．Consumers can distinguish retailers that rely on quick-response manufacturing from retailers that do not.

E．(E) Consumers do not suddenly stop buying models patterns, or styles that have just become popular.

某网站“共和国脚印”专栏，以共和国建立至今每一年发生的一件重大事件为“脚印”，回顾历史，启示后人。其中，“1956年”的“脚印”应当是   

A．开始进入社会主义初级阶段

B．“大跃进”人民公社化运动运动开始

C．“ * * ”爆发

D．改革开放开始

The boy's name ____________ Jack.[ ]

A. are

B. am

C. is

D. /

某研究者，为了验证氯霉素对伤寒的疗效，在408例伤寒病人中进行对照试验，其中251例用氯霉素治疗，其余157例不用。结果使用组251人中死亡20人，死亡率7．07％，未用组157人中死亡36人，病死率22．8％，已有结论被亲自证实。

在人体实验中使用对照组、安慰剂和“双盲法”（）

A.是对病人的一种欺骗

B.是违背人道主义原则的

C.是违背知情同意原则的

D.以征服疾病为目标，为发展医学的需要，严格控制在不损害病人利益的范围之内使用这一方法，是合乎医学道德的

E.是医学科研中经过考验的正确方法，可以在人体试验中无条件使用

代维人员应注意区分：（）、防雷接地等地气的连接情况，避免误操作引起设备的接地悬空而遭雷击。