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【简答题】
45钢试件调质后, =310MPa,m=9, = ,该试件的工作载荷分别为: =450MPa,作用 次, =400MPa,作用 次,则此时该试件的计算( )MPa,计算安全系数为( ),若再以 =350MPa作用于试件,还能循环() 次。计算结果保留两位小数。
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【简答题】Why doesn’t the unemployment rate ever reach zero? Economists, who generally believe that supply tends to meet demand, have long thought about this question. Even in good times, i.e. not now, there ar...
【单选题】Because it is difficult for economists to use experiments to generate data, they generally must
A.
do without dat
B.
substitute assumptions for data when data are unavailable.
C.
rely upon hypothetical data that were previously concocted by other economists.
D.
use whatever data the world gives them.
【判断题】Economists generally believe that policies such as reducing barriers to trade are likely to foster economic growth.
A.
正确
B.
错误
【判断题】Economists generally believe that inward-oriented policies are less likely to foster growth than outward-oriented policies.
A.
正确
B.
错误
【判断题】Economists generally believe that, although there may be advantages to society from ticket-scalping, the costs to society of this activity outweigh the benefits.
A.
正确
B.
错误
【单选题】Economists have generally found that economic growth rates have a close relation to:
A.
openness to trade
B.
education
C.
communications infrastructure
D.
all of these
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