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【单选题】
下列关于操作系统的描述,正确的是()。A.
操作系统中只有程序没有数据
B.
操作系统提供的人机交互接口其他软件无法使用
C.
操作系统是一种最重要的应用软件
D.
一台计算机可以安装多个操作系统
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皮皮学刷刷变学霸
举一反三
【单选题】The growth rate of real GDP per person in the United States has
A.
averaged approximately 2 percent per year over the past century.
B.
has consistently been 2 percent per decade over the past century.
C.
has been the highest in the world over the past 5 decades.
D.
has increased every year over the past century.
【单选题】Labor productivity, real GDP per labor hour, increases if
A.
saving and investment cause an increase in the quantity of capital per worker.
B.
there is an increase in the accumulation of human capital.
C.
new technologies are continuously discovered.
D.
All of the above answers are correct.
【简答题】行政复议机关应当审查具体行政行为的（）
【单选题】Over the past 100 years real GDP per person in the United States, on average, has
A.
decreased by about 5 percent per year.
B.
increased by about 2 percent per year.
C.
increased by about 5 percent per year.
D.
increased by about 10 percent per year.
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