题目内容
（请给出正确答案）
[单选题]
在操作系统中，Wait（s)和Signal（s)操作是一种（)。
A.机器指令
B.作业控制命令
C.系统调用命令
D.低级进程通信原语
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题目内容
（请给出正确答案）
如果结果不匹配，请 联系老师 获取答案
题目内容
（请给出正确答案）
A.机器指令
B.作业控制命令
C.系统调用命令
D.低级进程通信原语
如果结果不匹配，请 联系老师 获取答案
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Barbara calls Mr. Smith to make an appointment.
Barbara: Hello, Mr. Smith. This is Barbara, the sales()of Audi. We met at the car exhibition last Friday.
Mr. Smith: Oh, yes. I was just going to call you. I really like that car you recommended and I am thinking of buying it.
Barbara: Good choice. Why don't you come to our store and we can work out the()of purchase？ What time will be convenient for you？
Mr. Smith: I'll be out of town tomorrow, but almost any time after that would be fine with me.
Barbara: Well, could we make a tentative()for, say, this Saturday？
Mr. Smith: That's fine for me. Can you tell me your store's()and opening hours？
Barbara: It's near the Workers' Stadium. And we are open from 9 a.m. to 5 p.m.
Mr. Smith: Then, I'll come to your store around 10 o'clock.
Barbara: OK. I will wait for you in the store. And don't forget to bring your driver's().
Mr. Smith: OK, see you then.
