按水体的形式,水体水景可分为(),按水流的状态,水体水景可分为()
A、自然式
B、规则式
C、混合式
D、静态
E、动态
参考答案:A, B, C, D, E
the buildings were knocked down in the earthquake in the city of Tangshan..
A.A great deal of
B.A great many
C.The number of
D.A great many of
辐射防护中常用的单位是()
A.照射量率
B.吸收剂量
C.比释动能
D.剂量当量
E.剂量当量率