连词成句。

1. by, we, going, train, are (.)

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2. to, China, a, have, we, trip (.)

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3. Palace Museum, we, to, go, the (.)

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4. stay, my, they, with, three, weeks, family, for (.)

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拨道作业时，指挥人员跨立在标准股上看道指挥，一般应在距拨道处约（）米左右处，拨直线地段漫弯时，约100米左右处。