（）can be regarded as a vessel restricted in her ability to maneuver．
Any aircraft designed to maneuver on the water
B. A vessel engaged in dredging，surveying or underwater operations
C. A vessel under sail provided that propelling machinery is not used
D. A small vessel sailing at night
到目前为止，我国总共已经推广了多少套广播体操？（）
A. 17套
B. 18套
C. 19套
D. 20套
布莱克认为社会学模式关注的焦点是规则而不是社会结构。
A. 正确
B. 错误
简述扶养的概念和特征。（按广义上的抚养作答，包括抚养和赡养）
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