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【单选题】
将编程器内编写好的程序写入 PLC 中, PLC 必须处在( )模式。A.
运行
B.
停止
C.
监控模式
D.
运行或停止均可
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举一反三
【单选题】The principle purpose of this passage is to ______
A.
talk about the American culture in transition
B.
criticize the American culture
C.
state the absurdity of American culture
D.
talk about the inventions and discoveries
【单选题】What does the passage mainly talk about?
A.
How American goods axe produced.
B.
How American consumers buy their goods.
C.
How American economic system works.
D.
How American businessmen make their profits.
【单选题】If an American is invited to talk something about entertainment industry, be or she might not mention______.
A.
Broadway
B.
Oscar
C.
Grammy
D.
West Point
【单选题】The principal purpose of this passage is to______.
A.
talk about the American culture in transition
B.
criticize the American culture
C.
state the absurdity of American culture
D.
talk about the inventions and discoveries
【单选题】What is the topic of the talk?
A.
American society.
B.
Life of American farmers.
C.
Agriculture of America.
D.
Thomas Jefferson's dream.
【简答题】写出下列化合物属于哪一种结构类型。
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