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【简答题】
笼型异步电动机的起动方法主要有 和 两种;绕线式异步电动机的起动方法主要采用 。
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参考答案:
举一反三
【单选题】听力原文:W: Excuse me, sir. Can you tell me how much it costs to send an airmail letter to Paris? M: That's one dollar if it is not overweight. W: How about postcards? M: That will cost you 80 cents. W: W...
A.
At the airport.
B.
In a post office.
C.
In a store.
D.
At a receptionist.
【单选题】麻黄根的使用注意事项是
A.
肺虚者忌用
B.
年老体弱者忌用
C.
孕妇忌用
D.
有表邪者忌用
E.
脾胃有湿热者忌用
【单选题】如图所示的悬臂梁,自由端受力偶M的作用,粱中性层上正应力σ及剪应力τ为 ( )。
A.
σ=0,τ=0
B.
σ=0,τ≠0
C.
σ≠0,τ=0
D.
σ≠0,τ≠0
【单选题】听力原文:W: Excuse me, sir. Can you show me your passport? M: All right. Q: What will the man do? (21)
A.
Show his passport.
B.
Get to the airport.
C.
Read the book.
【单选题】如图所示的悬臂梁,自由端受力偶m的作用,关于梁中性层上正应力σ及切应力τ的下列四种表述中,只有()是正确的。
A.
σ≠0,τ=0
B.
σ=0,τ≠0
C.
σ=0,τ=0
D.
σ≠0,τ≠0
【单选题】听力原文:W: Excuse me, sir. Could you tell me where the post office is? M: Walk down the street for 2 blocks, the post office is right on the left-hand comer. Q: What do you learn from this conversation? ...
A.
The man is showing the woman around the city.
B.
The speakers are talking about sending letters.
C.
The man is a stranger to the city.
D.
The woman is asking the way.
【单选题】听力原文:W: Excuse me, sir. How do you wish to draw your money? M: Would you please give me hundred-yuan notes and the rest in small change? Q: Where is the conversation taking place? (14)
A.
In a department store.
B.
In a hotel.
C.
At the customs office.
D.
In a bank.
【单选题】听力原文:W: Excuse me, sir. Can you tell me how much it costs to send an airmail letter to Paris? M: That's one dollar if it is not overweight. W: How about postcards? M: That will cost you 80 cents. W: W...
A.
At the airport.
B.
In a post office.
C.
In a store.
D.
At a receptionist.
【单选题】听力原文:M: Excuse me, were you talking to me just now? W: Yes, sir. You forgot your change. Where are they talking?
A.
At home.
B.
In a school.
C.
In a shop.
【单选题】听力原文:W: Excuse me, sir. Can you tell me how much it costs to send an airmail letter to Paris? M: That's one dollar if it is not overweight. W: How about postcards? M: That will cost you 80 cents. W: W...
A.
At the airport.
B.
In a post office.
C.
In a store.
D.
At a receptionist.
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