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【单选题】
自动控制系统按（）来分类，可以分为温度、压力、流量、液位、转速等控制系统。A.
操纵变量
B.
被控变量
C.
控制规律
D.
工艺要求
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【单选题】What is the author's forecast about the future oil price or economy?
A.
The economy will stay unaffected by the high oil price.
B.
The economy will be hit if the oil price keeps high.
C.
The oil price will surely drop by the end of the year.
D.
The oil price will keep on rising in the rest of the year.
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