在重质或不稳定的土壤和陡峭的斜坡上，浇注混凝土挡土墙效果良好，让其他墙成为不明智的选择。
Poured concrete retains walls work well in the heavy or unstable soil and steep slopes, making other walls inadvisable.
现浇混凝土挡土墙以及在繁重的工作或不稳定的土壤和陡坡作出其他墙壁不明智的。
Poured concrete retaining walls work well where heavy or unstable soil and steep slopes make other walls inadvisable.
当工作条件不明或不稳定时，出口管路中必须安装节流阀，以保证泵在设计点运行。
A throttle valve must be installed along outlet pipeline when the conditions of work are not clear or stable, this can guarantee operation at the design point.
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