单项选择题
The （）(包装货) is loaded and unloaded by cargo sling.
A. bagged cargo B. packed cargo C. cased cargo D. deck cargo
单项选择题 The（）(折叠式舱盖) can fold slowly.
单项选择题 The（）(侧滚式舱盖) runs along the guide rail.
单项选择题 The（）(滚动式舱盖) runs along the guide rail.
