一幅图的( )和( )的比,叫做这幅图的比例尺。
图上距离;实际距离
275. A telephone is an instrument by which we can speak to people far away. The underlined word means ____.
A.a tool
B.an experiment
C.an expression
D.an instruction
()
A.黄山
B.栖霞山
C.雁荡山
D.武当山