preoperational stage是什么意思

用法例句

Ten Large White×Landrace×Huai pig finishers stressed by preslaughter transportation (stressed group) and 5 Large White×Landrace×Huai without stress(control group) were used in this study to test carcass, viscera and meat quality.

本试验对 1 0头宰前运输应激的大长淮 (大白×长白×淮猪 )肥育猪 (试验组 )和5头宰前无应激的大长淮肥育猪 (对照组 )作了胴体、内脏及肉质测定。

, the perceptive stage, pre operation stage,concrete operation stage and formal operation stage.

皮亚杰认为 :儿童的认知发展经历从感知运动、前运算、具体运算到形式运算四个主要阶段 ,不同阶段各有其认知发展方面的主要特点 ,所有儿童的认知发展都是按照这样的发展顺序发展起来的。

Influence of preoperative physical activity on the prognosis of patients after coronary artery bypass surgery;

手术前运动对冠状动脉搭桥手术后患者预后的影响

The paper summarizes the current situation of global top PCB manufactures, including the list of top PCB manufacturers, their revenues, current operation situation and development opportunity.

文章介绍了目前全球产值超过1亿美元的PCB制造企业的基本状况,主要包括这些顶尖PCB企业近两年的产值、目前运营状况和未来发展机会。