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【简答题】
某器件型号为DZ5-20/320,DZ表示该器件是 ,5表示 ,20表示 。
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【简答题】在PLC栈操作中,有进栈指令( ),出栈指令 ( )和读栈指令 ( )
【简答题】在PLC的栈操作中,有进栈指令_______,出栈指令_______。
【单选题】The room ___________. It’s a real mess.
A.
must be cleaned up
B.
must cleaned up
C.
must clean up
【单选题】My sister _____ want to be a reporter _____ it's kind of erous. [ ]
A.
doesn't, but
B.
don't, and
C.
doesn't, because
D.
can't, so
【单选题】Why is so silent in the room? He _________asleep in the room.
A.
should be
B.
must be
C.
must have been
D.
should have been
【单选题】If Chen Lu weren't a reporter, she'd be a teacher.
A.
Chen Lu isn't a reporter
B.
Chen Lu isn't a teacher
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