汽轮机转子按形状可分为（）转子。
A、整段式
B、转轮式
C、组合式
D、转鼓型
参考答案：B, D
In April, 2009, President Hu inspected the warships in Qingdao, _____ the 60th anniversary of the founding
of the PLA Navy. [ ]
A. marking
B. marked
C. having marked
D. being marked
旅游行政管理部门应对各类旅行社及外国旅行社常驻机构实行属地管理。( )
