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【单选题】
压力容器中最常用的不锈钢是( )。A.
马氏体不锈钢
B.
体型不锈钢
C.
球型钢
D.
奥氏体型不锈钢
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举一反三
【单选题】听力原文：M: Do you know what happened to me today? I was so embarrassed. W: What? M: Well, Dr. Brown's class finished ten minutes early, so I went to the library between classes. I knew I didn't have much...
A.
One of his classes finished early.
B.
His books were ten days overdue.
C.
He wanted to get some studying done.
D.
The library had a special display on the Industrial Revolution.
【单选题】---_________ ? ---I’m not sure, but he might have been ill in bed.
A.
What do you think has happened to Tom
B.
What do you think Tom has happened
C.
Do you think what has happened to Tom
D.
Do you think what Tom has happened
【单选题】80C 51 单片机的EA引脚接+5V时,程序计数器PC的有效地址范围是______。
A.
1000H ~ FFFH
B.
0000H ~ FFFFH
C.
0001H ~ OFFFH
D.
0000H ~ FFFH
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