第1题: [单项选择]The two most effective generating forces of surface ocean currents are(). A. temperature and salinity differences in the water B. wind and density differences in the water C. water depth and underwater topography D. rotation of the Earth and continental interference 参考答案:B
第2题: [单项选择]在市场调查的方法中,与网络调查法相比,观察法的特点有(). A. 调查范围广,不受时间和空间限制 B. 调查费用低 C. 直观可靠 D. 对调查者的素质要求高 E. 占用被调查者时间较多 参考答案:C, D 答案解析: