临近排卵期，雌激素的分泌量随之增加。As ovulation gets nearer, oestrogen levels rise.雌激素是一种雌性荷尔蒙。Oestrogen is a female sex hormone.所有的性激素, 例如雌激素 、 黄体酮和睾酮都是类固酮.All the sex hoymones, e . g. estrogens, progesterone, and testosterone, are ster...
介绍阻火器的分类、选型及安装.Introduces the categories of arresters and their type selection and installation.水泵选型时, 其水流量比主机水流量大15%至20%左右.Pump selection, the current host of water flow than 15 - 20 % or so.机电系统控制硬件的选型设计是一件非常繁复的工作.To s...
Don't be surprised to find your biggest interrupter is your boss!如果你最大的被打扰的来源是你的老板的话你千万不要感到奇怪!The vacuum degreevacuum interrupter will have the direct effect upon the properties of vacuum switch.真空灭弧室内真空度将直接影响真空开关的性...