应答器采用横向安装方式时，与钢轨平面垂直的方向为（）轴。
参考答案：Z
单句改错。
( )1.I'm used to live in the country now.
A B C D
( )2. The teacher told us that light traveled faster thansound.
( )3. They says they will go there by the plane.
( )4. The patient’s family are watching the operation with video.
( )5. The policeman prevented the children not to play football on the busy road.
交调测量原理在工作频带内选择合适的两频率f1、f2，使交调产物f3＝2f1-f2（或2f2-f1）落在工作频带内，则（）.
A.测量的交调最小值应满足该项指标的要求
B.测量的交调最大值应满足该项指标的要求
C.测量的交调均衡值应满足该项指标的要求
D.测量的交调平均值应满足该项指标的要求
