A. 抽象思维、具体思维 B. 直接思维、间接思维 C. 判断思维、推理思维 D. 想象思维、直觉思维
A. 正确 B. 错误
A. increases the lifting capacity of the hook B. protects the hook from the sling ring C. prevents the sling ring from coming out of the hook D. All of the above