用多个支撑点同时限制一个自由度，使过定位使工件定位更加稳固。
参考答案：错
-----Would you please repeat it?
-----Obviously, you _____me.
A．hadn’t listened to
B．were not listening to
C．haven’t listened to
D．don’t listen to
J1字节失配会产生（）告警。
A、HP-SLM
B、HP-UNEQ
C、HP-TIM
D、HP-AIS
