单项选择题
“SWL” means （）.
A. safe working load B. safe work load C. safe worked load D. safely working load
单项选择题 （）do you want the derrick adjusted?
单项选择题 Look, the derrick is too high. I want it adjusted （）.
单项选择题 This cargo light is not （）enough. Please change it for a new one.
