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【单选题】
离子渗氮的电压一般为
A.
220-400V
B.
400-800V
C.
> 800V
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【单选题】公理化方法从本质上说它属于一种:
A.
类比推理
B.
归纳推理
C.
演绎推理
D.
直觉推理
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【单选题】铰链四杆机构具有急回特性的条件是
A.
θ>0°
B.
θ=0°
C.
K=1
【单选题】铰链四杆机构具有急回特性的条件是 。
A.
θ >0 °
B.
θ =0 °
C.
K=1
D.
K<1
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