下列引文反映井田制的实质的是
A．今大道既隐，天下为家
B．普天之下，莫非王土
C．富者田连阡陌，贫者无立锥之地
D．更名天下田为王田
答案：B
有效焦点大小在摄影时的变化规律为（）
A.管电压越大焦点越大
B.管电流越大焦点越大
C.曝光时间越长焦点越大
D.照射时间越长焦点越小
E.摄影距离越大焦点越小
— What is the model plane like?
— Well, the wings of the plane are _____ of its body. [ ]
A. more than the length twice
B. twice more than the length
C. more than twice the length
D. more twice than the length
