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【判断题】
A-G-M系统,既有电压负反馈和电压微分负反馈,又有扰动补偿和过载自动保护,是一种复合控制系统。A.
正确
B.
错误
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【单选题】9) Between 1950 and 2004, standards of living in the OECD countries
A.
did not change at all.
B.
were converging.
C.
decreased at the same rate.
D.
decreased, but at different rates.
E.
all increased at the same rate.
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