The sample of spline coated with nylon was made through electrostatic spraying, and the jack horse and road running test was also carried out.
采用静电喷涂法制得尼龙涂覆花键样品，并进行了台架和道路行驶试验。
3
Over the past 25 years, Jack Fletcher at the University of Texas in Houston and his colleagues have been visiting Costa Rica to test the mental skills of very heavy users.