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【单选题】
下面说法不正确的是（）。
A.
管道半径以下回填时应采取防止管道上浮、位移的措施
B.
管道回填时间一昼夜中气温最低时段，从管道两侧同时回填，同时夯实
C.
沟槽回填从基础部位开始到以上500mm范围内，必须采用人工回填；500mm以上部位，可用机械从管道轴线两侧同时夯实；每层回填高度应不大于200mm
D.
回填作业的现场试验段长度应为一个或不少于100m，因工程因素变化改变回填，应重新进行现场试验
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【单选题】Which of the following statements about economic models is valid?
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include all relevant facts.
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are not useful because they omit many real-world details.
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are usually composed of diagrams and equations.
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contribute very little to economists’ understanding of the real world.
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requirement
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【单选题】Which of the following statements about economic models is valid?
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Economic models are built to mirror reality exactly.
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Economic models are useful, but they should not be used for the purpose of improving public policies.
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