选择题：地震区客运专线路堤应选用震动稳定性较好的填料，不应采用粉、细砂作填料。×√

在铁路路基设计技术工作中，下列说法错误的有（　　）A、 勘察设计单位执行（或采用）单项或局部标准，并不免除设计单位及设计人员对整体工程和系统功能质量问题应承担的

15.Which babies have trouble in learning to speak?A) Some severely retarded chil

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23. At a later stage, some new problems _______, which seemed more difficult to

1. — Seven thirty? I guess I.d better get going for the meeting at eight o.clock