多项选择题

关于数据选择器74151，下列表述正确的是：
A、使能端为低电平有效
B、是一个八选一的数据选择器
C、当使能端有效时，输出和输出F总是互反的。
D、当使能端无效时，输出和F均为0

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单项选择题

（） A. B. C. D.

单项选择题

F: Bob, did you contact technical support about my computer? I’m working on an important presentation, and all my work is on that computer.
M: Yes, I called them. They told me they’d send someone over tomorrow afternoon.
F: Tomorrow afternoon? That will be too late. I’m meeting with my clients at 4 tomorrow to discuss ways to promote their company. Could you please call tech support again, and ask them if they can come any sooner?
M: Sure, I’ll call them right away. I’ll talk to a supervisor to make sure they get a technician over here today.
What will Bob do later?
A、Call the supervisor
B、Buy a new computer
C、Cancel the meeting
D、Sign a contract