单项选择题

运行状态指示灯显示橙色表明PLC处于()。

A.STOP
B.RUN
C.STARTUP
D.ERROR
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Listen to the recording and answer the following questions.What is Feliciano dos Santos?
______
What does dos Santos sing about?
______

答案: He is a famous African musician.He sings about social issues...
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