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【单选题】
反应式步进电动机的转速n与脉冲频率f的关系是：()。A.
成正比
B.
成反比
C.
f2成正比
D.
f2成反比
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反馈参考答案：
举一反三
【单选题】(544)以下关于螺纹切削螺栓说法正确的是( )?
A.
螺纹切削螺栓将螺纹无切屑的在预钻好的钻孔里压出
B.
由于较大负荷,其只用于加工M8以下的螺纹
C.
螺纹切削螺栓在其尾部有个较短的用于螺纹制成的部分
D.
螺纹切削螺栓可以任意使用
E.
螺纹切削螺栓用于连接薄壁板材
【简答题】Fill in the blanks with the words and expressions given below. Change the form where necessary. Each word or expression can be used only once. advocate involve confine respond ...
【单选题】—What's this in English? —_______. [ ]
A.
Yes, it's a baseball
B.
No,it isn't
C.
It's an eraser
【简答题】Fill in the blanks with the words and expressions given below. Change the form where necessary. Each word or expression can be used only once. advocate involve confine respond ...
【简答题】Fill in the blanks with the words and expressions given below. Change the form where necessary. Each word or expression can be used only once. advocate involve confine respond ...
【简答题】Fill in the blanks with the words and expressions given below. Change the form where necessary. Each word or expression can be used only once. advocate involve confine respond ...
【单选题】—What's this in English? —_____. [ ]
A.
Yes, it's a pen
B.
No, it isn't a pen
C.
It's clock
D.
It's a book
【单选题】关于消费观,下列观点正确的是( )
A.
只要是自己赚的钱，怎么消费是自己个人的事情
B.
消费是一门学问，只有用科学消费观来引领自己的消费，才是正确的
C.
勤俭节约、艰苦奋斗就是要尽量少花钱
D.
环境保护是件利国利民的大事，但和我们的消费行为没有关系
【简答题】Fill in the blanks with the words and expressions given below. Change the form where necessary. Each word or expression can be used only once. advocate involve confine respond ...
相关题目：
【单选题】—What's this in English? —_______. [ ]
A.
Yes, it's a baseball
B.
No,it isn't
C.
It's an eraser
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