You have a durable subscriber, and the subscriber is down or not reachable when the message is produced. Which two options regarding the expiry of these messages are true?（）
A . after the subscriber is unavailable for 10 minutes
B . when the subscriber is available
C . after the subscriber is unavailable for after an hour
D . are available until the specified time elapses
E . are expired instantly
相似题目
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A . Repeat the message using any other channel on which you might attract attention
B . Key the microphone several times before transmitting again
C . Turn up the volume on the receiver before transmitting again
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A . Welcome to our restaurant.
B . Yes, sure. This way, please.
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A . diploma
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-That’s a beautiful dress you have on! -（）
A . Oh，thanks.I got it yesterday
B . Sorry，it’s too cheap
C . You can have it
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You have a computer that runs Windows 7. You have an application installation package named app1.msi.You need to perform a customized installation of app1.msi. What should you do?（）
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A . It is suitable for me.
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A . 正确
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A . Cipher.exe /s.
B . Driverquery.exe /si.
C . Msinfo32.exe /q.
D . Pnputil.exe i.
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Do you have a ?
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A: I have a toothache. B:You should .
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_ a week if you have a partner and _ a week if you are single
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You might as well have a rest.
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—That's a beautiful dress you have on —（）
—That&39;s a beautiful dress you have on —（）
A．Oh,thanks.I got it yesterday.
B．Sorry,it's too cheap.
C．You can have it.
D．See you later.
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– Have you got a table for four, Waiter？ – （).
A．A. Welcome to our restaurant
B．B. Yes, sur
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D．D. We have booked the seats
E．E. Here are the menus
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A．Why
B．What
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Once you have finished the design, you may have a whole week.
A.off
B.down
C.in D.up
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A:Do you think we have met before?
B:Idon'tthnikso
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Jony: Do you have a car？
Bill: Yes,I do.___8___
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Bill: It was new in 2008.
John: So, it's pretty old now.
Bill: Yes,it is.___9___
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Bill: Oh,yes.___10___ And my mechanic changes the oil twice a year.
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" You have put a bug in his ear" means that you have________.
A．made him laugh
B．shown concern for him
C．made fun of him
D．given him some kind of warning
此题为多项选择题。
