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【简答题】
利用PLC实现下列控制要求,要求如下:电动机起动后经过5s后M2会自动起动,且M2可以实现点动及M2可以单独停止。 (1)设计I/O接线图。 (2)设计梯形图。 (3)写出对应的语句表。
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【多选题】我国目前最常用的食品防腐剂是()
A.
柠檬黄
B.
苯甲酸钠
C.
山梨酸钾
D.
番茄红素
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【单选题】—What you on the weekend ?     —I read books. [     ]
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 do, do
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【简答题】阅读理解。 According to the American Automobile Association, since 19 all cars sold in the United States have been equipped with seat belts. (These are also called safety belts.) Mary studies of automobi...
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【简答题】According to the American Automobile（car）Association, since 19 all cars sold in the United States have been equipped with seat belts（带子）(They are also called safety belts) Many studies of car accide...
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【单选题】What should you do if your child is under six years old?
A.
You should let him take two tablets a day
B.
You should reduce the dosage anyway.
C.
You should find the directions on the bottle.
D.
You should ask the doctor for advice.
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【简答题】The TV programme has______onthe children as______as the old. A. agood effect good B. apositive effect well C. agood affect well D.affect well
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【单选题】与语句 Select*From Tabl Where Instr([简历],“篮球”)0功能相同的是( )
A.
Select * From Tabl Where 简历 Like "篮球"
B.
Select * From Tabl Where 简历Like "*篮球"
C.
Select * From Tabl Where 简历 Like "*篮球*"
D.
Select * From Tabl Where 简历Like "篮球*"
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【单选题】Kate asked the girls to so she could hear what her husband said onthe phone.
A.
slow down
B.
come down
C.
settle down
D.
break down
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【单选题】我国目前最常用的食品防腐剂是()
A.
维生素C
B.
甜菜红
C.
苯甲酸钠，山梨酸钾
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【简答题】(2009.12) We welcome you aboard the Eastern Flight and will do our best to make your trip comfortable and enjoyable. For your safety and convenience To begin the trip, we would like to draw your atten...
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【多选题】我国目前最常用的食品防腐剂是()
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【简答题】(2009.12) We welcome you aboard the Eastern Flight and will do our best to make your trip comfortable and enjoyable. For your safety and convenience To begin the trip, we would like to draw your atten...
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