It is unrealistic to believe perfection is an attainable goal.相信完美可以企及是不现实的。They set the limits of performance attainable.它们确定着可达到的运行限度.If objectives are to be meaningful to people, they must be clear, attainable, action...
深海声纳式高度计是装备在深海探测设备上的回声测深装置.Abstract : Deep - sea sonar altimeter is a depth sounder to equip deep - sea detection devices.高度计是用来测量海拔高度的.An altimeter is used for measuring height above sea - level.介绍一种适用于微型飞行器的新型微型 高度计 的设...
A total of 109 patients underwent physical examination, electrocardiogram and echo cardiography.总计109个病人做了体格检查, 心电图,超生心动图.Objective To Validte the Yeliabil of left ventricle ejection fraction ( LEF ) measured by reconstr...