关于故障的概述,说法错误的是( )
A. 人员误操作引起的故障属于突发性故障,也属于外因故障
B. 一般来说,破坏性故障既是突发的又是永久的
C. 轴承的故障导致其他轴承的振动增大,而该轴承本身的振动变化反而不明显,这表明故障具有放射性;
D. 一般来说,系统的故障率随着使用时间的增加而逐渐增加
下列关于传感器的说法错误的是( )
A. 霍尔器件是磁补偿式电流传感器实现非接触式电流测量的关键
B. 压电式压力传感器和压电式加速度传感器主要用到材料的压电效应
C. 一般来说,陶瓷湿度传感器的电阻随着湿度和温度的增加而减小
D. 湿度传感器一般采用直流电压,因为交流电压会引起感湿体内水分子电解,导致电导率下降
2. As a guest, your primary responsibility is to ______ .Don't make your host guess about this.3. When you are invited, you need to convey the information like ______ , ______ , ______ to your host and hostess. Don't surprise them.
1. In a high power distance culture, every person has a ______ place and role in a strong ______ .2. In a low power distance culture, there is a strong expected for ______ .