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【单选题】
减速箱的输出轴选用的材料为40cr,要求具有良好的综合力学性能,轴预表面要求具有高硬度和高耐磨性,工艺流程为:1正火,2调质,3表面淬火+低温回火,4下料,5锻造,6磨削,7粗加工,8精加工,其合理的加工工艺流程为( )。A.
④⑤①⑦②⑧⑥③
B.
④⑤①⑦②⑧③⑥
C.
④⑤①⑦③②⑧⑥
D.
④①⑤⑦③②⑧⑥
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【简答题】根部吸收的矿质元素向上运输主要通过 ,也可横向运到 后再向上运输。
【单选题】Suppose the country of Quasiland experienced a decrease in real GDP and people were laid off from their jobs. The people would be considered part of
A.
frictional unemployment.
B.
structural unemployment.
C.
cyclical unemployment.
D.
discouraged workers.
【单选题】Suppose country A, a labor-abundant country, produces only wheat and cloth. The following equations illustrate the prices and costs of wheat and cloth in the country, where the numbers indicate the am...
A.
the real income of the landowners will increase but that of the laborers will remain unchanged.
B.
the purchasing power of the laborers will increase but that of the landowners will decline.
C.
the real income of both the landowners and the laborers will decline.
D.
the purchasing power of both the landowners and the laborers will increase.
【单选题】Suppose the country of Dingo experienced an economic trough in January 2011. We can conclude that
A.
real GDP in Dingo was increasing in January 2011.
B.
an expansion occurred after January 2011.
C.
Dingo did not experience a recession in 2010.
D.
Dingo's potential GDP fell in 2011.
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