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【单选题】
远距离远距离输电,原来用电压 U 0 输电,在输电线上损失的电功率为 P 0 ,现在要使输电线上损失的电功率减小到原来的 1/10 ,则输电电压应为 。A.
100 U 0
B.
U 0
C.
U 0 /10
D.
U 0 /100
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【简答题】如果关于x的方程x 2 +2（a+1）x+2a+1=0有一个小于1的正数根，那么实数a的取值范围是______．
【单选题】What is true about the IKEA effect?
A.
It refers to the phenomenon that people usually undervalue their creations.
B.
It is put forward by the honorable and successful manufacturer IKEA
C.
It explains why the participants think highly of their own origami.
D.
It accounts for the popularity of do-it-yourself among youngsters.
【单选题】Usually people under stress _____ express their full range of potential.
A.
care for
B.
tend to
C.
happen to
D.
lead to
【单选题】“Multi local people” usually refers to those people who are under the impact of different culture.
A.
T
B.
F
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