题目内容
冲击回波声频法（IAE）对隧道衬砌进行检测时存在哪些缺点？
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冲击回波声频检测技术（IAE）采用拾声器拾取被测体的振动信号，并传送到信号处理仪器；将所记录的信号进行分析，从而确定结构的厚度和缺陷的位置。
Identifying main ideas and supporting ideasComplete the main ideas (M) and supporting ideas (S) for three paragraphs of the passage. Write no more than three words in each blank.Para. 5M: Marketing Companies get information about customers from social media sites and show them______________.S1: Marketing companies work with __________________to find out where their customers live.S2: Marketing companies work with social media sites to find out who are their customers’ __________.
Para. 6M: Today’s teenagers do not seem to be as worried about marketing companies targeting them through ads on social media as they are about _________________ ___________ from their parents.S1: Members of Generation Z such as Valerie do not like their parents wanting to see ____________ online.S2: Valerie limits what her parents can see about what she does on_____________.
技术方案建成后，建设投资形成（）、（）和（）。
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