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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。

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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；

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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.

A. 对
B. 错

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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.

A. 对
B. 错

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A plane simple harmonic wave propagates in an elastic medium. At a certain instant (在某一瞬时), a certain mass element (某质元) in the medium is in equilibrium position, then its .

A. kinetic energy is zero, and potential energy is the largest
B. kinetic energy is zero, and potential energy is zero
C. kinetic and potential energies are both highest and largest
D. kinetic energy is largest zero, and potential energy is zero

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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。

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.

A plane simple harmonic wave propagates in an elastic medium. At a certain instant (在某一瞬时), a certain mass element (某质元) in the medium is in equilibrium position, then its .

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。