在做凸透镜成像的实验中发现,当物距u=5cm时,光屏上不能得到像,当物距u=8c

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问题:

在做凸透镜成像的实验中发现,当物距u=5cm时,光屏上不能得到像,当物距u=8cm时,光屏上能得到倒立的像,则下列判断中正确的是(  )

A.u=17cm时,一定成缩小的实像

B.u=14cm时,可能成缩小的实像

C.u=10cm时,一定成缩小的实像

D.u=4cm时,一定成放大的实像

考点:凸透镜对光的作用
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《经济日报》载文指出,当今世界,文化与经济政治日益交融,在综合国力竞争中的地位和作用越来越突出,我们要始终坚持社会主义先进文化的前进方向,把树立社会主义荣辱观与弘扬社会主义先进文化紧密结合起来。坚持社会主义先进文化的前进方向

A.是建设中国特色社会主义文化的根本保证

B.是建设中国特色社会主义文化的根本要求

C.是立党立国之本

D.能避免我国思想文化的多样化

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Dongfang Import & Export Co (Dongfang Co) and Lidar Steel Company (Steel Co) entered into a cooperation contract. According to the contract Dongfang Co was responsible for the importation of 10,000 metric ton (M/T) of iron ore and exportation of pig iron 6,000 M/T, while Steel Co was responsible for the processing of iron ore into pig iron; Steel Co was also under the obligation to complete the processing within 10 days upon the arrival of iron ore and then carry the pig iron to Tianjin port for export by Dongfang Co.On 10 March 2008 the first shipment of 5,000 M/T iron ore arrived at the designated port and was promptly carried to the premises of Steel Co for processing.10 days later the second shipment of 5,000 M/T arrived at the Chinese port. However Dongfang Co found that several bank accounts of Steel Co were frozen by the order of the court in a dispute with a third party. Therefore, it immediately despatched a written memo to Steel Co, stating that it would detain the second shipment of iron ore until Steel Co delivered the processed pig iron.Upon the receipt of the notice, Steel Co sent back a fax to express its sincere regret for its delay to deliver pig iron. Steel Co emphasised, however, that it suffered from insufficient funds to buy coke for the processing. It promised to make efforts to deal with this problem, but failed to specify any concrete measures to be taken or give the necessary security for the performance of the contractual obligation. Steel Co also urged that Dongfang Co deliver the remaining 5,000 M/T of iron ore.Considering the date for the shipment of pig iron was approaching but Steel Co did not deliver any processed pig iron, Dongfang Co declared the dissolution of the cooperation contract and sold the remaining 5,000 M/T of iron ore to a third party. Under such circumstances Steel Co brought an action against Dongfang Co for damages on the ground that Dongfang refused to deliver the second shipment of 5,000 M/T iron ore for processing.Required:Answer the following questions in accordance with the relevant provisions of the Contract Law of China, and give your reasons for your answer:

(c) State whether Steel Co’s claim should be supported by the court. (1 mark)

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pH = 2与pH = 5的两强酸溶液各10 mL,混合后溶液的pH为       

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仪表不包括( )

A.整洁
B.发型
C.衣着
D.举止

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班计划由主管副站长(调度室主任或运转主任)()编制。(C、3、Y)[05-00-02-04][030102]

A.组织

B.协调

C.亲自

D.指示

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