《石油产品蒸气压测定法（雷德法）》代号是GB/T（）-1987。 A.5096 B.

当代教育学发展的趋势是（ ）

A．教育学的研究模式呈现单一化

B．教育学研究与教育实践改革的关系日渐疏远

C．教育学加强对自身的反思，形成教育学的元理论

D．教育学研究的问题领域缩小

Az is an international metals broker with clients all round the world.In January he entered into three contracts:(a) the first, to supply Brad with 1,000 tonnes of aluminium;(b) the second, to supply Chad with 1,000 tonnes of copper;(c) the third, to supply Dan with 1,000 tonnes of tin.Although Az had immediate access to the metals from his extensive reserves, delivery on all three contracts was to take place on 1 May. However, as he wanted to reduce his exposure to such a large inventory of metals Az decided to supply the metals to the three other parties earlier than the contract date; 1 March rather than 1 May.Because Az’s inventory of aluminium was only 1,000 tonnes that is what he sent to Brad.However, as he had larger inventory of copper and tin, he decided to send an additional 500 tonnes to both Chad and Dan, over and above their agreed amounts.At the end of February, after Az had despatched the metals, the international metals market suffered a severe upheaval, with the price of copper falling by 50% and the price of tin increasing by the same percentage. The price of aluminium remained constant.Required:Advise Brad, Chad and Dan as to their rights under the UN Convention for the International Sale of Goods. (10 marks)

下列那些是制动系的作用（）

A.减速停车

B.防止传东西过载

C.驻车不动

D.改变车辆行驶方向

信息加工理论认为信息加工经历这几个阶段（）、注意、知觉、短时记忆、长时记忆。

（）可避免一般充填中所发生的裹气和涡流现象。

A.一级压射

B.二级压射

C.三级压射