当待测频率（）传感器的固有频率时，传感器测得的动态参数会严重失真。
参考答案：等于
The Smiths _____ their bags with their clothes in the sitting room. [ ]
A. are busy filling
B. is busy filling
C. are busy to fill
D. is busy to fill
在上述各种非语言交流中属于空间语言的是（）。
A.手势、面部表情
B.姿势、人际距离
C.惊讶声、惊喜声和感叹声
D.提前到达
E.交流环境
