更多“不同于其他学科，历史学的界限在不同时代都是在不断变化的。”相关的问题
All mammals, except man and the monkey, swim naturally from birth. For man, like the monkey, it is not instinctive to float. Deaths by drowning are common everywhere. In the United States alone, about 7,000 children under four drown each year. Everything possible is done to prevent such tragedies. One solution’ s particularly effective—teaching children to swim while they are still babies. Most large towns in Florida and California already run lessons for babies and infants. The idea has spread to Europe where, in several countries, special courses are now arranged for children from seven to twenty-four months. The first step is to eliminate the child’ s fear of the water. Next, he’s taught to float. Once he can do this naturally and without fear, the child grasps the technique and can push forward himself through the water.
All mammals, except man and the monkey, swim naturally from birth. For man, like the monkey, it is not instinctive to float. Deaths by drowning are common everywhere. In the United States alone, about 7,000 children under four drown each year.
Everything possible is done to prevent such tragedies. One solution’ s particularly effective—teaching children to swim while they are still babies. Most large towns in Florida and California already run lessons for babies and infants. The idea has spread to Europe where, in several countries, special courses are now arranged for children from seven to twenty-four months.
The first step is to eliminate the child’ s fear of the water. Next, he’s taught to float. Once he can do this naturally and without fear, the child grasps the technique and can push forward himself through the water.
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如果作用在物体上两力的合力为零，则称为（）。
A . A、力的合成
B . B、力的分解
C . C、力的平衡
D . D、不受力
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对于课程编制，( )在批判目标模式的基础上提出了过程模式。
A、泰勒
B、斯腾豪斯
C、施瓦布
D、赞可夫
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北京的天主教堂有
A.西什库教堂
B.王府井教堂
C.缸瓦市教堂
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汉族传统节日有春节、元宵节、清明节、端午节、中秋节。()
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患者，男性，41岁。因发现乙型肝炎表面抗原阳性15年，反复乏力、尿黄1年余，加重伴发热、恶心15天入院。入院查体：T38℃，P96次／分，R20次／分，BP120／76mmHg；皮肤巩膜重度黄染，可见...以病人的病情为依据，不考虑医院和病人经济条件的限制，选择对诊断最有价值的检查。该患者急诊需要进行以下那些检查（）
A.血常规
B.尿常规
C.电解质
D.肝、肾功能检查
E.乙肝血清标志物
F.血氨测定
G.凝血酶原时间与活动度
H.头颅CT或核磁共振检查
I.腰穿、脑脊液检查
J.脑血流图
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In a three-month period last year, two Brooklynites had to be cut out of their apartments and carrie...The two Brooklynites in the first paragraph were ______.
A．members of the NAAFA
B．typical victims of overweight
C．members of the "fatlash" movement
D．proof that the fatlash movement is gaining strength
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微型计算机的显示器有阴极射线型的及液晶型两大类。下列英文术语缩写的正确表示是（）。
A.阴极射线型用LCD表示 B.液晶型用LCD表示 C.液晶型用CRT表示 D.阴极射线型用EGA表示
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资金时间价值的实质是（）
A、利息率
B、资金周转使用后的增值额
C、利润率
D、差额价值
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()是指学生只能按照数学事实、数据、定理、概念、法则等所表现的形式进行记忆。
A、理解记忆B、概括记忆C、机械记忆D、短时记忆
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DHTML技术不包括（）。
A.客户端的脚本程序语言B.文档对象模型C.层叠样式表D.嵌入式样式表
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在场内或人多的场所焊接，应放置（）以免他人受弧光伤害
A . 遮光档板
B . 铁板
C . 木板
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当你讲话时说到“3”，却伸出了5个手指，这属于说话者引起的（）障碍。
A.语言层次障碍 B.声音层次障碍 C.身体语言障碍 D.语意层次障碍
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熄焦泵出水泵上防止水流倒灌的部件是逆止阀。 ()此题为判断题(对，错)。
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