It is a technical difficulty to control the deformation and the stress condition of the structure of large-scale shield shaft in over-river shield tunnel project.
控制超大盾构工作井的变形和结构受力状态是跨江跨海盾构隧道工程设计和施工的技术难点。
There are usually three main features about the pilot plant test sample:large mass and large grain size of samples, difficulty to control the sample grade.
半工业选矿试样一般有三大特点：质量大、矿岩石样粒度大及控制送样品位难度大。
There are usually three main features about the pilot plant test sample:large mass and large grain size of samples, difficulty to control the sample grade.
半工业选矿试样一般有三大特点：质量大、矿岩石样粒度大及控制送样品位难度大。
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