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【单选题】
以下不属于JAVA关键字的是:()
A.
implement
B.
public
C.
finally
D.
course
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【单选题】迷走神经传出纤维的冲动可看作是
A.
控制系统
B.
受控系统
C.
控制信息
D.
反馈信息
E.
干扰信息
【多选题】S7-200 CPU有哪些工作模式?()
A.
STOP(停止),CPU停止工作,不执行程序,PC机可向PLC下载程序和系统设置;
B.
RUN (运行),运行用户程序
C.
WORKING(运行),机器正常运行模式
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【判断题】梯形图是一种以图形符号及图形符号在图中的相互关系表示控制关系的编程语言。
A.
正确
B.
错误
【单选题】( )是四种存单中最重要、也是历史最悠久的一种,它由美国国内银行发行。
A.
国内存单
B.
欧洲美元存
C.
扬基存单
D.
储蓄机构存单
【单选题】梯形图是一种以图形符号及图形符号在图中的相互关系表示控制关系的编程语言,是从()中演变过来的。
A.
继电器控制系统
B.
单片机
C.
工业电脑
D.
机器人
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