【单选题】【消耗次数：1】
钢的下列组织中热稳定性最差的是（）。
①
珠光体
②
回火屈氏体
③
马氏体
④
回火索氏体
参考答案：
复制
纠错
相关题目
【单选题】
高速钢淬火后进行多次回火的主要目的是（）。
①
消除残余奥氏体,使碳化物入基体
②
消除残余奥氏体,使碳化物充分析出
③
使马氏体分解,提高其韧性
④
消除应力,减少工件变形
【单选题】
高碳钢淬火后回火时,随回火温度升高其（）。
①
强度硬度下降,塑性韧性提高
②
强度硬度提高 ,塑性韧性下降
③
强度韧性提高,塑性硬度下降
④
强度韧性下降,塑性硬度提高
随机题目
【单选题】
Well done. Congratulations on your success.
①
Thank you very much
②
Oh, no, no
③
No, I didn’t do very well
④
Sorry, I couldn’t any better
【单选题】
Good morning, sir. May I help you?
①
No, I don’t buy anything
②
No, I don’t need your help
③
Yes, I need some sugar
④
Oh, no. That’s OK
【单选题】
I’d like to take you to the coffee house on the corner.
①
Thank you. You shouldn’t’ do that
②
Thanks, I’d like to go with you
③
No, you can’t say so
④
No, no, You can’t do that
【单选题】
He’s determined to finish the job __________ long it takes.
①
no matter
②
however
③
wherever
④
whatever
【单选题】
-- Could I speak to John Harris, please.
①
Oh, how are you
②
I’m John
③
I’m listening
④
Speaking
【单选题】
Why don’t you travel to New York on vacation?
①
I don’t want to go
②
Excuse me, because I can’t
③
I want to, but I haven’t got enough money
④
Because I’m going to school today
【单选题】
Could you help me with my homework, please?
①
No, no way
②
No, I couldn’t
③
No, I can’t
④
Sorry I can’t. I have to go to a meeting right now
【单选题】
Determined to __________ as if everything were normal, he responded with a kind of indifference.
①
carry on
②
account for
③
bring up
④
get through
【单选题】
Mary, your dress is really beautiful. How is John?
①
Thank you very much
②
No, no, John is not bad
③
Thank you. He is fine
④
Don’t say that. It’s ugly. John is good
【单选题】
Excuse me, sir. Where is Dr. Brown’s office?
①
You can’t ask me
②
Pardon? I have no idea
③
Please don’t say so
④
Sorry I don’t know, but you can ask the man over there