数控系统为了检测刀盘上的工位，可在检测轴上安装_______。
A.角度编码器
B.光栅
C.磁尺
参考答案：A
_____ what would happen，none of them could find a way out.
A．Left wondering
B．Having left wondering
C．Leaving to wonder
D．Having left to wonder
T波振幅低平是指（）。
A.<同导联R波1/10
B.<同导联R波1/4
C.<同导联R波1/5
D.<0.5mV
E.<0.2mV
