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【单选题】
由于人们不诚实、不正直或有不轨企图，故意促使风险事故发生，以致引起财产损失和人身伤亡的因素属于（ ）。A.
有形风险因素
B.
心理风险因素
C.
道德风险因素
D.
实质风险因素
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【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】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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