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【简答题】
PLC 系统与继电接触器系统工作原理的差别。
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反馈参考答案：
举一反三
【简答题】I hope your wishes will come true in the future.
【简答题】在铰链四杆机构中,当最短构件和最长构件的长度之和小于或等于其他两构件长度之和时,取与最短杆相邻的 构件为机架,机构为 ;取最短杆为机架,机构为 ;取与最短杆相对的构件为机架,机构为____。 A .双摇杆机构 B.双曲柄机构 C .导杆机构 D.曲柄摇杆机构
【单选题】听力原文：W: I certainly like to meet your parents, but I feel a little nervous. I hope they will like me. M: Take it easy, my parents will approve of any girl I like. Q: What is the probable relationship ...
A.
Husband and wife.
B.
Manager and candidate.
C.
They are dating each other.
D.
Room keeper and a visitor.
【单选题】—Do you have any wishes? —________. I hope I'll be more active. [ ]
A.
Not really
B.
Yes,I am
C.
Of course I do
D.
I have no idea
【单选题】听力原文：W: How is your job? I hope you can establish a good relationship with your new comrades. M: I couldn't feel better about it! I have forgotten my miserable days in the former company. Q: How does ...
A.
He is very satisfied with it.
B.
He has to spend the miserable days.
C.
He thinks it should be better.
D.
He has some problems with his comrades.
【单选题】磁路的欧姆定律：对于一个材料相同、截面积相等的铁磁性材料构成的闭合磁路，磁势等于（）
A.
磁通与磁阻的积
B.
磁通与磁阻的商
C.
磁通与磁阻的和
D.
磁通与磁阻的差
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