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问题 单项选择题

设有4个作业同时到达，每个作业的执行时间均为2h，它们在一台处理器上按单道式运行，则平均周转时间为( )。

A．1h

B．5h

C．2.5h

D．8h

答案

参考答案：B

解析：4个作业，各执行时间分别是2h、4h、6h、8h，所以4个作业都完成的时间为2+4+6+8=20h。此时，平均周转时间=各个作业完成时间之和/作业个数=20/4=5小时。

判断题

居民企业技术转让所得不超过500万元的部分，免征企业所得税。（）
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问答题

Passage 1 The US dollar value of Chinese exports increased at an average rate of almost 18 per cent per annum between 1978 and 1983, while imports increased by approximately 11 per cent per annum. As a result, the visible trade surplus rose sharply from US $1.4 billion in 1981 to US $4.4 billion in 1982 and US$3.7 billion in 1983. Exports grew much faster than imports during this period not only because of the p emphasis placed on exporting by China’s economic planners, but also because a number of industrial projects were postponed in 1979. Official recognition that foreign technology could play a major role in modernising the Chinese economy had caused imports to rise by more than 50 per cent in 1978 placing undue strain on the national economy. Grain imports have fallen sharply over the past few years—China became a net grain exporter in 1984—and in 1983 the country started to export soyabeans and cotton.

Why did the more than 50% rise in imports of 1978 place undue strain on China’s national economy
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