如果电焊条当天用不完，可再烘干后使用，烘干的次数不得超过（）。A、2次 B、3次 C、4

根据薪酬业务循环内部控制的要求，有权签字确认生产车间考勤记录的是：

A．财务部门主管

B．人力资源部门主管

C．生产车间主管

D．行政管理部门主管

证券公司对证券经纪业务人员的绩效考核和激励应将（）作为考核的重要内容。

A.客户交易量

B.被考核人员行为的合规性

C.服务的适当性

D.客户投诉的情况

（6分）化学小组同学在实验室发现了三瓶无标签待区分的白色固体，标为A、B、C分别是碳酸钠、硫酸钠、碳酸钙中的一种。（提示：可溶性的钡盐有毒）

【提出问题】如何区分出三种物质?

【进行实验】甲、乙两位同学进行了如下实验：

步骤一：甲、乙的实验设计与操作相同，分别取A、B、C 瓶中的样品少量于试管中，试管编号对应记为1、2、3号，加等量的水，观察到2号中产生白色浑浊，1、3号中得到无色溶液。

步骤二：甲、乙的实验操作如下图所示：

【表达与交流】乙认为甲的实验无法区分1、3号溶液，理由是（1）                

                                                           。

【证据与结论】经过思考，甲在步骤二的基础上，继续向1、3号管中加入足量稀盐酸，1号中产生的明显现象是（2）                 ，产生此现象的化学方程式为（3）                。乙同学在区分1、3号中的溶液时选择的与甲不同类别的某试剂是（4）           。两位同学通过实验都区分出了三种固体。请将三种固体物质的化学式分别标在广口瓶的标签上（5）。

【反思与评价】对比甲、乙的实验，请你从安全性、简约性的角度对甲或乙同学的实验进行评价 （6）                                               。

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患者，女性，7岁，因颈正中部肿物来院求治。查体见肿物位于舌骨下部，质软，界清，与表面皮肤及周围组织无粘连。肿物可以随吞咽动作而上下活动。穿刺液为微浑浊的黄色黏稠液。最有可能的诊断是（）

A.鳃裂囊肿

B.囊性水瘤

C.神经鞘瘤

D.甲状舌管囊肿

E.皮样囊肿