图中甲乙两地的相对高度是( )
A.400米
B.200米
C.100米
D.600米
读图可得,甲地的海拔是300米,乙地的海拔是100米,甲乙两地的相对高度是200米.
故选:B.
It is the third time that she _____ the role of Juliet ever since she graduated from university.[ ]
A. has played
B. had played
C. is playing
D. played
下列关于设备机械振动检测仪的功能,说法正确的是()。
A.可显示振动位移峰有效值大小
B.可显示振动速度峰值大小
C.可实时显示振动波形
D.具有频谱分析功能