三级B 2018.12We assure you that your order will(deliver)____within 5 workdays.
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三级B 2018.12If you choose not to receive those emails, please let us know by(send)____us a message.
三级B 2018.12We are responsible for the installation and repair of the(equip)____.
三级B 2018.12If you find any product that is(cheap)____than ours in other stores, please contact ____us.
中隔墙的作用在于分隔隧道、形成中心支柱,从而“增大”开挖断面,减小隧道断面效应,同时传递荷载
A. 对
B. 错