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【单选题】
铁磁材料在磁化过程中，外加磁场H不断增加，而测得的磁场强度几乎不变的性质称为（ ）A.
磁滞性
B.
剩磁性
C.
磁性
D.
磁饱和性
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举一反三
【单选题】what do many observers predict in view of the experience of the 20th century?
A.
Economic growth will slow down.
B.
Government budgets will increase.
C.
More people will try to pursue higher education
D.
There will be more competition in the job market.
【单选题】Which of the following statements about global carbon emissions are correct?
A.
In 2013, the largest national contributions to the net growth in total global carbon emissions in 2013 were China (58% of the growth), US (20% of the growth), India (17% of the growth), and EU28 (a decrease by 11% of the growth).
B.
From 1870 to 2014, cumulative carbon emissions totaled about 545 Gt
【单选题】The growth of international trade in services has been driven by advances in:
A.
communications
B.
transportation
C.
agriculture
D.
energy
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