Because the number of cars in America is growing faster than the population, there are already more automobiles than families in the whole country.
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确定设备更新的最佳时刻是设备的()。
A. 自然寿命
B. 技术寿命
C. 经济寿命
D. 前三者的平均
建设工程项目估算过程中,在初步可行性研究阶段的估算误差为()。
A. 10%
B. 20%
C. 25%
D. 30%
方言是同一个民族语言里的地域分支,在确定方言身份的时候,要同时考虑两方面的因素:______和______。
Now, listen to the passage.
This passage is most probably intended for
[A] textile technicians.
[B] common housewives.
[C] average audience.
[D] space travelers.