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【单选题】
气门（valve）是汽车引擎内部相当重要的零件之一，气门直接与高温燃气接触，因此在材质上必须有足够的刚性强度以及耐热性。现有一种气门由两部分材料组成，大头部为21－4N奥氏体材料，头部锥面工作表面堆焊钴基合金 STELLITE F，在高温下具有很强的耐磨，耐腐蚀，耐冲击及高的蠕变强度，杆部材料为4Cr9Si2，表面镀铬处理，保证气门杆部耐磨性，提高气门寿命。大头部与杆部合理的连接方法为：。 【图片】
A.
闪光对焊
B.
电阻对焊
C.
摩擦焊
D.
手工电弧焊
E.
埋弧自动焊
F.
点焊
G.
电渣焊
H.
氩弧焊
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参考答案：
举一反三
【单选题】听力原文：W: You ought to write to Linda. She's been sick and does so like to get letters. M: All right. My hands are full, but I shouldn't have neglected her. Q: What do we learn about Linda? (15)
A.
She likes to get mail.
B.
She is angry for being neglected.
C.
She is their best friend.
D.
She is their employee.
查看完整题目与答案
【单选题】低碳钢材料的拉伸曲线分为 ( )个阶段。
A.
2个
B.
4个
C.
1个
D.
3个
查看完整题目与答案
【单选题】伊斯兰教的创复兴者,穆斯林公认的的伊斯兰教先知是( )。
A.
以实玛利
B.
亚伯拉罕
C.
穆罕默德
D.
以撒
查看完整题目与答案
【单选题】听力原文：W: I heard you took a trip to Mexico. How did you like it? M: Oh, I got sick and tired of hotels and hotel food. It was such a long journey that I felt exhausted wherever I went. As the saying go...
A.
Great but tiring.
B.
Relaxing and memorable.
C.
Unsatisfactory and exhausting.
D.
Exhausting but worthwhile.
查看完整题目与答案
【单选题】低碳钢拉伸时的应力应变关系曲线依次分为( )、( )、( )、( )。
A.
线弹性阶段，屈服阶段，强化阶段，局部变形阶段
B.
屈服阶段，弹性阶段，强度阶段，局部变形阶段。
C.
弹性阶段，屈服阶段，强度阶段，局部变形阶段。
D.
弹性阶段，强度阶段，局部变形阶段，屈服阶段。
查看完整题目与答案
【单选题】听力原文：M: Doctor, I feel sick. I have a bad stomachache, and my head troubles me a lot. W: Well, let me have a check. Open your mouth, please. And say 'Ah'. M: Ah! Is that serious, doctor? W: Not really...
A.
Yes, he did.
B.
No, he didn't.
C.
We are not sure.
查看完整题目与答案
【单选题】听力原文：W: I think I am running a temperature, and I feel sick. M: OK. Let's have a check-up. Come into the examination room, please. Q: What is the probable relationship between the two speakers? (18)
A.
Father and daughter,
B.
Teacher and student.
C.
Doctor and patient.
D.
Boss and secretary.
查看完整题目与答案
【单选题】低碳钢拉伸时的应力应变关系曲线依次分为（ ）、（ ）、（ ）、（ )。
A.
弹性阶段，强化阶段，局部变形阶段，屈服阶段
B.
线弹性阶段，屈服阶段，强化阶段，局部变形阶段
C.
屈服阶段，弹性阶段，强化阶段，局部变形阶段
D.
弹性阶段，屈服阶段，强化阶段，局部变形阶段
查看完整题目与答案
【单选题】听力原文：W: I think I'm running a temperature, and I feel sick. M: OK. Let's have a check-up. Come into the examination room, please. Q: What is the probable relationship between the two speakers? (13)
A.
Father and daughter.
B.
Doctor and patient.
C.
Teacher and student.
D.
Boss and secretary.
查看完整题目与答案
【多选题】低碳钢的拉伸曲线可分为（ ）几个阶段。
A.
弹性变形阶段
B.
屈服阶段
C.
强化阶段
D.
缩颈阶段
查看完整题目与答案
相关题目：
【单选题】听力原文：W: You ought to write to Linda. She's been sick and does so like to get letters. M: All right. My hands are full, but I shouldn't have neglected her. Q: What do we learn about Linda? (15)
A.
She likes to get mail.
B.
She is angry for being neglected.
C.
She is their best friend.
D.
She is their employee.
查看完整题目与答案
【单选题】低碳钢材料的拉伸曲线分为 ( )个阶段。
A.
2个
B.
4个
C.
1个
D.
3个
查看完整题目与答案
【单选题】伊斯兰教的创复兴者,穆斯林公认的的伊斯兰教先知是( )。
A.
以实玛利
B.
亚伯拉罕
C.
穆罕默德
D.
以撒
查看完整题目与答案
【单选题】听力原文：W: I heard you took a trip to Mexico. How did you like it? M: Oh, I got sick and tired of hotels and hotel food. It was such a long journey that I felt exhausted wherever I went. As the saying go...
A.
Great but tiring.
B.
Relaxing and memorable.
C.
Unsatisfactory and exhausting.
D.
Exhausting but worthwhile.
查看完整题目与答案
【单选题】低碳钢拉伸时的应力应变关系曲线依次分为( )、( )、( )、( )。
A.
线弹性阶段，屈服阶段，强化阶段，局部变形阶段
B.
屈服阶段，弹性阶段，强度阶段，局部变形阶段。
C.
弹性阶段，屈服阶段，强度阶段，局部变形阶段。
D.
弹性阶段，强度阶段，局部变形阶段，屈服阶段。
查看完整题目与答案
【单选题】听力原文：M: Doctor, I feel sick. I have a bad stomachache, and my head troubles me a lot. W: Well, let me have a check. Open your mouth, please. And say 'Ah'. M: Ah! Is that serious, doctor? W: Not really...
A.
Yes, he did.
B.
No, he didn't.
C.
We are not sure.
查看完整题目与答案
【单选题】听力原文：W: I think I am running a temperature, and I feel sick. M: OK. Let's have a check-up. Come into the examination room, please. Q: What is the probable relationship between the two speakers? (18)
A.
Father and daughter,
B.
Teacher and student.
C.
Doctor and patient.
D.
Boss and secretary.
查看完整题目与答案
【单选题】低碳钢拉伸时的应力应变关系曲线依次分为（ ）、（ ）、（ ）、（ )。
A.
弹性阶段，强化阶段，局部变形阶段，屈服阶段
B.
线弹性阶段，屈服阶段，强化阶段，局部变形阶段
C.
屈服阶段，弹性阶段，强化阶段，局部变形阶段
D.
弹性阶段，屈服阶段，强化阶段，局部变形阶段
查看完整题目与答案
【单选题】听力原文：W: I think I'm running a temperature, and I feel sick. M: OK. Let's have a check-up. Come into the examination room, please. Q: What is the probable relationship between the two speakers? (13)
A.
Father and daughter.
B.
Doctor and patient.
C.
Teacher and student.
D.
Boss and secretary.
查看完整题目与答案
【多选题】低碳钢的拉伸曲线可分为（ ）几个阶段。
A.
弹性变形阶段
B.
屈服阶段
C.
强化阶段
D.
缩颈阶段
查看完整题目与答案
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