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病人,女性,18岁,经期持续10天,量较多,诊断为无排卵性子宫出血,给予口服大剂量己烯雌酚治疗。病人询问用药目的,护士正确的解释是
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Listen to the song twice and fill in the blanks with what you hear. There comes a timeWhen we ___________________________________,When the worldMust___________________________________ as one.There are people dying;And it’s time to___________________________________to life,The greatest gift of all.We can’t go on pretending day by dayThat someone somewhere will soon___________________________________.We are the partOf God’s great big family.And the truth you know,Love is___________________________________.We are the world,We are the children,We are the onesWho make a brighter day.So let’s start giving.There’s a choice we are making,We are saving our own lives.It’s true we’ll make a better day,Just you and me.Send them___________________________________.So they’ll know that someone cares.And their lifeWill be___________________________________.As God has shown us,By turning___________________________________.So we all must lend a helping hand.We are the world,We are the children,We are the onesWho make a brighter day.So let’s start giving.There’s a choice we are making,We are saving our own lives.It’s true we’ll make a better day,Just you and me.When you’re___________________________________,There seems no hope at all.But if you just believe,There’s no we can fail.Let us realizeThat a change can only comeWhen we___________________________________as one.We are the world,We are the children,We are the onesWho make a brighter day.So let’s start giving.There’s a choice we are making,We are saving our own lives.It’s true we’ll make a better day,Just you and me.
交流负反馈是指（ ）
直流负反馈能够（ ）
根据反馈的效果可以区分反馈的极性，使放大电路净输入量增大的反馈称为正反馈。
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