单项选择题
用HMI中I/O域功能显示定时器当前值的时候,PLC中定时器当前值的变量数据类型为( )。
A、Time
B、Bool
C、Byte
D、Word
用HMI中I/O域功能显示定时器当前值的时候,PLC中定时器当前值的变量数据类型为( )。
A、Time
B、Bool
C、Byte
D、Word
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单项选择题
I wish I could ________ and relive my schooldays; I regret not having tried harder and passed more exams.( )
I wish I could ________ and relive my schooldays; I regret not having tried harder and passed more exams.( )
A.put the clock back
B.do without
C.cut off
D.put across