You must rig pilot ladder（）port side. ["on","in","at","for"]
什么是中图法？
用于描述数据分布范围的是（） ["极差","方差","变异系数","标准差"]
假设人口分布均匀，下列哪项服务的服务范围最大（） ["米店","服装店","空调专卖店","汽车交易市场"]
Your（）is 175 degrees from the lighthouse. ["bearing","position","location","place"]
混凝土的和易性包含哪三方面的含义？
