多项选择题 营销渠道结构的类型可分为（）。

单项选择题 书籍的参考文献格式Only one of the following MLA works cited entries is handled correctly. Select the correct answer.The student has quoted from page 580 of The American Promise: A History of the United States, 2nd compact edition, written by James L. Roark, Michael P. Johnson, Patricia Cline Cohen, Sarah Stage, Alan Lawson, and Susan M. Hartmann and published in 2003 by Bedford/St. Martin’s in Boston.

单项选择题 高速铁路接触网抢修人员应优先采取（）的方式出动抢修。