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【多选题】
共晶合金的特性包括A.
比纯组元熔点低，简化了熔化和铸造的操作
B.
共晶合金比纯金属有更好的流动性，其在凝固之中防止阻碍液体流动的枝晶形成，从而改善了铸造性能
C.
恒温转变减少了铸造缺陷，如偏聚和缩孔
D.
共晶凝固可获得多种形态的显微组织，尤其是规则排列的层状或杆状共晶组织，可能成为优异性能的原位复合材料
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举一反三
【单选题】The World Trade Organization ________.
A.
advises developing countries on issues of trade barriers
B.
promotes long-term economic development and poverty reduction
C.
exists to help countries conduct trade through a system of rules
D.
facilitates trade among third-world countries and developed nations
【简答题】Dreamweaver 8具有哪些特点?
【判断题】The World Trade Organization is primarily responsible for policing the world trading system and making sure nation-states adhere to the rules laid down in trade treaties signed by WTO members()
A.
正确
B.
错误
【单选题】The World Trade Organization:
A.
is the primary member of the North American Free Trade Agreement.
B.
resolves disputes between member nations arising from alleged violations of previous agreements dealing with international trade.
C.
is a world government with its own army.
D.
lends money to developing countries.
【单选题】The World Trade Organization
A.
has the power to enforce the rules of international trade.
B.
covers agriculture and physical goods, but not services or intellectual property rights.
C.
recently expelled China for human rights violations.
D.
ruled that NAFTA is to be the model for world trade integration.
【简答题】草坪草的分枝类型有哪些?其特点各是什么?
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