建设单位应在工程竣工验收前( )个工作日前将验收时间、地点、验收组名单书面通知该工

我国历史上第一个统一的多民族的中央集权国家是 

A、夏朝

B、西周

C、商朝

D、秦朝

补全对话。根据上下文把下面的对话补充完整。

A: What are you going to do after the exams?

B: 1__________________. Do you have any good ideas?

A: Yes, I went to relax myself. So I want to go on a trip.

B: Sounds great! 2__________________?

A: I'd like to go somewhere interesting and exciting.

B: There is a new zoo in Changsha 3__________________?

A: No, I haven't. What about you?

B: 4__________________. But my cousin went there last

    week. He told me people could watch the animals there in

    a more natural environment.

A: Really? That sounds interesting. Let's go to the zoo together.

B: OK. We can go there by bus tomorrow.

A: 5__________________? It's not too far from here. And riding

    a bike is a kind of good exercise.

B: OK. I can't wait.

46×□1要使积是四位数，□里最小填1。[ ]

简述免疫缺陷病的预防。

某建设单位对建设单位代表的授权范围以书面形式通知了施工单位。施工单位项目经理在建设单位代表权限范围外提出了一项要求，建设单位代表给予了签字认可。这一认可的法律后果应由( )承担。

A．建设单位与施工单位
B．建设单位与项目经理
C．建设单位代表与施工单位
D．施工单位与项目经理