已知x=-3y=2是二元一次方程ax-y=6的一个解，则a=______．

若等腰三角形的一个角为80°，则底角为______．

如图所示，金属线框ABCD由细线悬吊在空中，图中虚线区域内是垂直于线框向里的匀强磁场，要使悬线的拉力变大，可采用的办法有（    ）

A．将磁场向上平动

B．将磁场均匀增强

C．将磁场向下平动

D．将磁场均匀减弱

Questions from 31 to 35 are based on the following passage: Negotiations work wonders. This is particularly so in international business since it is mostly through negotiations that exporters and importers bridge their differences and reach a fair and mutually satisfactory deal. By presenting a more comprehensive negotiating package in a well planned and organized manner, exporters should be able to improve the effectiveness of their business discussions and in the long term the profitability of their export operations. To avoid being confronted by costly demands, an exporter should try to determine the buyer’s real interest in the products from the outset. This can be ascertained through appropriate questions but must also be based on research and other preparations before the negotiations. Only then can a suitable counter-proposal be presented. To achieve a favorable outcome from the negotiations, an exporter should draw up a plan of action beforehand, which addresses a few key issues. Experienced negotiators consider that as much as 80% of their overall time devoted to negotiations should go to such preparations. The preliminary work should be aimed at obtaining relevant information on the target market and the buyers of the products. It should also include developing counter-proposals if objections are raised on any of the exporter’s opening negotiating points. The preparations should thus involve formulating the negotiating strategy and tactics.In international marketing negotiations, it is advisable for small and medium-sized exporters not just to limit their discussions to pricing issues, although pricing is a key factor in any business transaction, exporters should give more attention to the full range of marketing factors. They should stress the strengths of their firms and products and match them with the perceived needs of the buyers. Once these issues have been covered, they can consider the question of price and are able to develop a profitable business.

A successful negotiator should be（）.

A．aggressive　

B．mild

C．well-prepared　

D．hesitative

下列关于药品检验机构的设置的说法，错误的是( )

A．国务院药品监督管理部门设置国家药品检验机构
B．省级药品监督管理部门可在本行政区城内设置药品检验机构
C．地方药品检验机构的设置规划由省级药品监督管理部门提出，报省政府批准
D．国务院和省级药品监督管理部门可以根据需要，确定符合药品检验条件的检验机构承担药品检验工作
E．只有国务院药品监督管理部门才可以根据需要，确定符合药品检验条件的检验机构承担药品检验工作

学校安全管理主要内容（）。

A.为保证学生在校期间的人身安全，学校必须提供符合国家安全标准的教育教学设施、设备。学校应配备必要的处理伤害事故的医疗用品。

B.学校教育工作者要尊重学生的人格尊严，禁止体罚或变相体罚学生。

C.学校的体育场地和器材应当符合卫生和安全要求，运动项目和运动强度应适应学生的生理承受能力和体质健康状况。

D.学校组织学生参加劳动或者集会、文化娱乐、社会实践等集体活动，应当有利于学生的健康成长，要进行安全教育，并提供必要的安全保障措施。