A crawler, device of girth welds testing outside pipeline is developed successfully.成功地研制了管道外检测机械装置—爬行器.The pool is divided into three sections with a crawler lane for beginners.泳池分三部分，有为初学者而设的慢泳道。The Google crawler does...
AST ( Aspertate Aminotransferase ) - Enzyme or protein that leaks from the damaged liver.AST 谷草 转氨酶 —— 从受损肝脏中泄露的酶或蛋白.Objective To develope the reference material for determing the AST activity concentration.目的为研制AST测定用的酶...