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商务送礼是一门艺术，有其约定俗成的规矩，送给谁、送什么、怎么送都很有奥妙，绝不能瞎送、胡送、滥送。请问，商务送礼应把握哪些基本原则？

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汛期暴雨中行车时，要充分利用“行安装备”的功能，加强（），与车站保持联系。

A. 瞭望
B. 鸣笛
C. 车机联控

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当来球较远，弧度较平时，可采用双跳步或交叉步移动。

A. 正确
B. 错误

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A vessel has been equipped with an oil lubricated stern bearing and is undergoing a routine dry-dock.Which of the following inspection should be made when the tail-shaft has been drawn?（）

A. The overall condition of the bearing surface should be examined
B. The shaft liner should be inspected for cracks and tested to insure a tight fit
C. The stern tube should be tested for cracks with dye penetrant
D. all of above

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制丝生产设备流程特点均为单机线性连机、上下流程控制；以（）为生产段落和端点。

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