采用二项式法计算负荷时，应将计算范围内的所有设备统一划组，不应逐级计算。()
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【C19】
A. attracts
B. checks
C. offers
D. pays
The specification of the maximum amounts of commodities which may be imported into a country in a period of time is a______.
A. tariff
B. quota
C. nontariff barrier
D. voluntary export restriction
The production possibilities curve represents______.
A. the amount of goods attainable with variable resources
B. the maximum amount of goods attainable with variable resources
C. maximum combinations of goods attainable with fixed resources
D. the amount of goods attainable if prices decline
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