单桩竖向抗压极限承载力，主要取决于以下哪种因素（） ["桩身强度和地基土强度","桩身尺寸和地下水位","桩身尺寸和地基土深度","桩身强度和地基土深度"]
医疗器械临床试验分（）。 ["医疗器械临床试用","临床研究","临床分析","医疗器械临床验证"]
柴油发动机怠速多少转？（）
一般而言，绝对成本优势的主要来源是（） ["专有工艺","资本要求","产品差异","企业战略性行为"]
Which of the following are correct statements？（） ["EIGRP advertises the best routes to its neighbor","EIGRP uses "cost" to determine best path","EIGRP allows unequal cost load balancing","OSPF requires neighbor adjacencies before updates are sent","EIGRP advertises all routes to its neighbor","OSPF allows unequal cost load balancing"]
简述希腊殖民运动原因
