marker bull是什么意思

用法例句

The objective of this experiment is to study the difference of teasing response of sow in early gestation period and non-pregnant sow.

本试验分别对配种后第26-31天未返情母猪(试验Ⅰ组,30头)、断奶后第4天未发情母猪(试验Ⅱ组,10头)和发情母猪(试验Ⅲ组,20头)以抚摸腰背部、压背和公猪试情3种方法进行试情,旨在探讨妊娠早期母猪与空怀母猪的试情反应的差异。

Examination conditions are designed.

目的探讨学优生和学差生在自然和考试情景下的手书变化特点。

The degree of stimulus which examinees have varies according to different examine situations.

不同的考试情境对参加考试的学生刺激强度是不同的。