The main assembly line is responsible for______.
A. the central part of the engine
B. the chassis
C. the body
D. the final adjustments
1990年该省就业人El占总人口的比重为()。
A. 50.96%
B. 52.19%
C. 53.09%
D. 82.37%
What can be inferred from the passage？
A. Ghostwriting is illegal.
B. Ghostwriting is a newly-born business.
C. Ghostwriting will become more popular in the future.
D. Ghostwriting can never happen in China.
为使在一定成本下产量能达到最大或在给定产量条件下成本最低，则要求()。
A. 等产量曲线与等收人曲线相切
B. 等成本曲线与生产可能性曲线相交
C. 等产量曲线与等成本曲线相切
D. 等成本曲线与等收入曲线相交
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