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Ex.3 Listen to the following conversation twice and fill in the blanks with the missing words. Getting to know the words and expressions in the box below first might be helpful.[音频]Shelley: I don't see much of you these days. How are you doing?Sam: 【填空1】. I don't have time to breathe. And you?Shelley: Pretty good. You look like you need 【填空2】.Sam: I know, but I have too much to do.Shelley: Come on, 【填空3】. Don't expect things to happen immediately.Sam: But, you know...Shelley: Take things【填空4】. You need to【填空5】.Sam: How?Shelley: Have you【填空6】practicing breathing?Sam: Huh?Shelley: Take【填空7】, hold it, and then exhale slowly.Sam: I'll【填空8】.

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桥梁五大部件包括

A. 桥跨结构
B. 支座系统
C. 桥墩
D. 桥台
E. 基础

挂篮施工又称为悬臂浇筑施工,是一个能沿梁顶滑动或滚动的承重系统,其锚固悬挂在已施工梁段上,在挂篮上可进行下一两段的各项作业,完成一个阶段的循环后,挂篮即可前移并固定,进行下一阶段的悬灌,如此循环直至悬臂灌注完成

A. 对
B. 错

油封是一种最常用的密封件,它适用在工作压力小于( )的条件下对( )和( )的密封。也可用于其他的( )、( )以及( )和( )的固体物质的密封。其功用在于把油腔和外界隔离,对内( ),对外( )。

油封与其他唇形密封不同之处在于具有( )的唇部,密封接触面宽度很窄(约为0.5mm)且接触应力的分布图形呈( )。

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