题目内容
主要用镐、条锄，少许用锹挖掘的土属（）。
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牛的胎衣正常排出时间是产后（ ）小时内，超过这个时间都是胎衣不下。
牛胎衣不下手术剥离的方法步骤是（）、（）、（）。（按操作顺序填序号）①用左手握住外露的胎衣并轻轻向外拉紧；②由近及远逐渐螺旋前进，分离母子胎盘；③右手沿胎膜表面伸人子宫内，探查胎衣与子宫壁结合的状态；
The Chinese and many other East Asians avoid long direct eye contact to show politeness, respect and obedience. While North Americans see eye contact as a sign of honesty and a lack of eye contact or shifty eyes as a sign of untruthfulness.
In some Asian countries, men had better not look at women straightly and too long while you are talking with them, even if you are listening to them attentively.
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