研究表明，与适度学习相比较，学习某材料的熟练程度达到________的时候，学习效果

下列情形不可以申请公积金个人住房贷款的是()。

A.购买商品房

B.集资建造住房

C.翻建自有住房

D.装修自有住房

产妇，25岁，G₁P₁，自然分娩后1日，感下腹阵痛，可忍受。问正常宫缩痛持续的时间，护士回答正确的是 （）

A.产后3～4天

B.产后6～7天

C.产后10～15天

D.产后20～25天

E.产后42天

患儿，女，9岁，因发现心脏杂音9年，发热20天，抽搐1次入院。在当地县医院住院治疗4天无效。查体：T39℃，P126次/min，R34次/min，体重22kg，神清，精神萎靡，口唇、颜面、睑结膜苍白，消瘦，双肺可闻及粗中湿啰音，心音有力，胸骨左缘第3～4肋间闻及2～3/6收缩期杂音，粗糙，腹软，全腹压痛，未扪及包块，脾左肋下1cm，四肢无异常。

假设血液分析示WBC21.6×10/L、N0.87、L0.13、RBC2.5×10/L、Hb80g/L，心脏彩色多普勒示室间隔缺损、三尖瓣前瓣发现0.5cm×0.3cm赘生物，胸片示双肺内絮状影，头颅CT无异常。目前可考虑急诊判断（）

A.先天性心脏病

B.肺炎

C.败血症

D.热性惊厥

E.化脓性脑膜炎

F.感染性心内膜炎

According to traditional Cherokee beliefs, we are part of (1) . We don’t (2) with it and we’re not trying to (3) it. We are a part of the Great Life. And within the Great Life, there are three great Laws of Nature, which tell us how we have to live in (4) with everything else. The First Law of Nature is that you don’t take any life without real (5) . So we shouldn’t (6) needlessly. We believe everything is alive, including animals, plants and (7) . And so to us, taking the life of a plant is just as grave a 8() as taking the life of an animal. The Second Law is that everything we do should (9) the Great Life. And everything we do (10) the Great Life, and everything that (11) within the Great Life affects us. So it’s very important that what we do will not (12) other parts of the Great Life. The Third Law basically is that we don’t (13) where we live. And where we live is not our (14) , small community. It’s this (15) . We don’t pour chemical (16) down the drain because they all wind up in the water. It might seem a little difficult to live by those three laws in this (17) society. But there are still a lot of things that we can do to bring these laws into our lives, such as (18) , using the (19) as little as possible, and (20) gardening.

简述附条件合同所设附款中的条件的特点。