在下列振动测量的仪器中，（ ）属于非接触式测量仪器。
A．电涡流位移传感器
B．磁电速度传感器
C．压电式加速度计
D．频谱仪
参考答案：A
下面程序的运行结果是SET EXACT ONs="ni"+SPACE(2)IF s=="ni"IF s="ni" "one"ELSE "two"ENDIF ELSEIF s="ni" "three"ELSE "four"ENDIF ENDIF RETURN
A．one
B．two
C．three
D．four
It was only when I reread his poem recently _____ to appreciate its beauty.
A．that I began
B．did I begin
C．I began
D．until I began
