采用超声波动态渗透、AA- GWR保水和表面吸收重量法研究了预涂纸与水及涂料间的相互作用。
The interactions of water-precoated paper and coating-precoated paper were analyzed by using three methods, which were ultrasound dynamic penetration, AA-GWR water retention and Cobb test.
本文推导了计及重力效应运动媒质中的次声波动方程和用速度的散度表示的分层大气模型下的频散方程；
The equation of infrasonic wave taking into account the gravitational effect in moving media is derived, with multi-layer atmospheric model.
有规律的重复活动如声波、光波、无线电波都有一个特定的频率，或者说是每秒的波动次数。
Regular repeating actions such as sound waves, light waves, or radio waves have a certain frequency, or number of waves per second.
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