题目内容
A．两子系统同时同步运行，当联机子系统出错时，它退出服务，由备份系统接替B．备份系统处于电源
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SECTION A CONVERSATIONS
Directions: In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow.
听力原文：W: What's the problem？
M: I can't figure out how to put the page numbers on. I've done everything and they aren't showing up.
W: Let's see. Did you press Shift, F87
M: Yes, I did that. Then ! hit P for page and N for number.
W: That's good. Did you type in the page number where you want the numbering to start？
M: Yes. I typed the number 1.
W: Right. Did you press Enter？
M: Yes.
W: How about F7 to return to the document？
M: I did that. But no numbers show up on the screen.
W: Un-huh, did you print it？
M: No, I don't want to print it until I see the numbers.
W: Well, that's the problem then. The numbers don't show up on the screen. But they will on the primed copy. Let's try that.
M: Okay. You do it this time, and I'll watch.
W: Well, I'll do if' as you want, but it would be better if you let me talk you through it.
M: I don't know.
W: Really. Once you've done it with someone coaching you, it's easier to do it on your own. Don't worry. This is my job.
M: Oh, all right. Shift F8.
W: Now hit P for page and N for number.
M: And the page number I want to start with is number 1.
W: Great! Just press Enter, then F7 to return to the document, and you're all set to print. Then you'll see those numbers.
What prompted this conversation？
危险物品的生产、经营、储存单位以及矿山企业、建筑施工单位有下列()的,责令改正,可以并处一万元以下的罚款。
我国居民膳食中，热能的主要食物来源是
细菌性痢疾病人的便是
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