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【单选题】
经科学研究发现,元素原子最外层电子数是8或第一层为最外层且电子数为2的原子是很稳定的,而最外电子层电子数是1的元素容易失去这个电子,最外层电子数是7的原子容易得到电子,如果原子最外层电子数是4,其单质在导电方面具有某些特殊的优良性能,如硅原子最外电子层有4个电子,因而常被用作半导体材料。下列可作半导体材料的是 [     ]
A.
铝Al
B.
氧O
C.
锗Ge
D.
氖Ne
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【多选题】风险投资对于高技术产业的发展的作用十分明显,主要表现在以下哪些方面()。
A.
有助于高新技术企业的成长壮大
B.
有助于政府的参与与鼓励
C.
有助于促进服务业等其他非高科技产业的发展
D.
有助于优化资金配置的流动机制和使用效率
【单选题】For a given, permanent reduction in demand for a product:
A.
the decrease in price will be greater the more elastic is supply.
B.
the decrease in price will be greater in the long run than in the short run.
C.
the decrease in price will be greater the more inelastic is supply.
D.
none of the above
【单选题】For a given level of
A.
nominal GNP, changes in interest rates cause movements along the L(R,Y) schedule.
B.
real GNP, changes in interest rates cause a decrease of the L(R,Y) schedule.
C.
real GNP, changes in interest rates cause an increase of the L(R,Y) schedule.
D.
nominal GNP, changes in interest rates cause an increase in the L(R,Y) schedule.
E.
real GNP, changes in interest rates cause movements along the L(R,Y) schedule.
【单选题】For a given increase in price, a greater elasticity of demand will result in a greater
A.
increase in quantity demanded.
B.
increase in demand.
C.
decrease in quantity demanded.
D.
decrease in demand.
【多选题】对于投资者而言,期权交易有哪些作用()。
A.
期权购买者的风险是一定的
B.
期权购买者的风险是无穷大的
C.
期权可用于保值
D.
期权交易可用于投机
E.
期权交易的收益是确定的
【单选题】下列不属于急性化脓性中耳炎的表现是 ()
A.
耳廓牵拉痛
B.
耳流脓
C.
鼓膜充血
D.
传导性耳聋
【单选题】For a given Vr and I, the voltage regulation of the line increases with a decrease in power factor for:
A.
Leading Loads
B.
Unity PF loads only
C.
Lagging loads
D.
None of these
【单选题】For a given decrease in demand, the effect on price is smallest and the effect on quantity exchanged largest when:
A.
supply is perfectly elastic.
B.
supply is elastic.
C.
supply is unit elastic.
D.
supply is perfectly inelastic.
【单选题】For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means?()
A.
An increase in compression ratio will increase the ignition lag
B.
An increase in compression ratio will decrease the ignition lag
C.
A decrease in compression ratio will decrease the ignition lag
D.
A decrease in ignition lag will increase the compression ratio
【单选题】For a given decrease in demand, the effect on price is largest and the effect on quantity exchanged smallest when:
A.
supply is perfectly elastic.
B.
supply is elastic.
C.
supply is unit elastic.
D.
supply is perfectly inelastic.
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