Psychometric tests can save organizations from grim and costly mistakes.心理测试能够使组织机构避免犯下损失惨重的大错。At the required level of visual verisimilitude, computer animation is costly.要使电脑动画的视觉效果达到要求的逼真程度，花费会十分昂贵。Coastal defence is ...
The invention relates to swing flapper used to kill mosquito and fly.本发明涉及一种用于捕杀蚊蝇的蚊甩子.And theoretical basis is presented to further apply nozzle - flapper valve to two - stage electro - hydraulic servo valve .较快的响应速度;为进...