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【单选题】
硅被誉为无机非金属材料的主角。据2001年12月的《参考消息》报道，有科学家提出硅是“21世纪的能源”“未来的石油”。下列有关说法正确的是A.
硅的含量居第二位，在地球上有丰富的单质硅资源，如石英、水晶、玛瑙的主要成分都是单质硅
B.
硅相对于氢气便于运输、贮存，从安全角度考虑，硅是有开发价值的燃料
C.
存放NaOH溶液的试剂瓶应用细口玻璃瓶并配磨口玻璃塞
D.
硅是一种良好的半导体材料，所以是制造光导纤维的基本原料
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【简答题】作用于皮肤粘膜及创伤防腐消毒药有________、________。
【简答题】Beer and pizza are complements because they are often enjoyed together. When the price of beer rises, what happens to the supply, demand, quantity supplied, quantity demanded, and the price in the mar...
【简答题】jump 作用于皮肤粘膜及创伤防腐消毒药有________、________。
【简答题】已知地层中某一单元土体,σ1=200kPa,σ3=120kPa,则该点的剪应力最大值τmax= kPa ,该剪应力最大值所在的面与水平面(最大主应力作用面)呈 °。
【单选题】Andy views beer and pizza as complements to one another. If the price of pizza decreases, economists would expect:
A.
Andy's demand for pizza to increase.
B.
Andy's demand for pizza to decrease.
C.
Andy's quantity of pizza demanded to decrease.
D.
Andy's demand for beer to increase.
【单选题】Pizza and beer are complementary goods for consumers in a local market. The beer industry, which has constant marginal cost, is perfectly competitive and is now in long run equilibrium. If the market ...
A.
The market price of beer falls and each firm produces less beer.
B.
The market price of beer does not change, but the quantity increases because new firms enter the beer industry.
C.
The market price of beer does not change, but the quantity decreases because some firms exit the industry
D.
The market price of beer rises and each firm produces more beer
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