什么叫低丘岗地改造？
参考答案：低丘岗地改造是指对地势相对较高、坡度25°以下、土地条件相对较差、缺水怕旱、利用效率不高的区片进行科学开发、综合利用。
社会主义宏观经济调控的目标是
A．保持经济总量平衡
B．抑制通货膨胀
C．促进重大经济结构优化
D．服从社会主义经济规律要求，满足人民日益增长的物质文化生活的需要
Coast Guard approved buoyant work vests（）.
A.may be substituted for 10 percent of the required life preservers
B.should be stowed adjacent to lifeboats and emergency stations
C.may be used by boat crews and line handlers during lifeboat drills
D.should be used when carrying out duties near a weather deck's edge
