更多“2M数字中继电路故障不会造成信令链路闭锁。”相关的问题
向量a={4，-3，4}在b={2，2，1}的投影为______．
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Is language, like food, a basic human need without which a child at a critical period of life can be starved and damaged Judging from the drastic experiment of Frederick II in the thirteenth century, it may be hoping to discover what language a child would speak if he heard no mother tongue, he told the nurses to keep silent.All the infants died before the first year. But clearly there was more than lack of language here. What was missing was good mothering. Without good mothering, in the first year of life especially, the capacity to survive is seriously affected.Today no such severe lack exists as that ordered by Frederick. Nevertheless, some children are still backward in speaking. Most often the reason for this is that the mother is insensitive to the signals of the infant whose brain is programmed to learn language rapidly. If these sensitive periods are neglected, the ideal time for acquiring skills passes and they might never be learned so easily again. A bird learns to sing and to fly rapidly at the right time, but the process is slow and hard once the critical stage has passed.Experts suggest that speech stages are reached in a fixed sequence and at a constant age, but there are cases where speech has started late in a child who eventually turns out to be of high IQ. At twelve weeks a baby smiles and makes vowel-like sounds; at twelve months he can speak simple words and understand simple commands; at eighteen months he has a vocabulary of three to fifty words. At three he knows about 1 000 words which he can put into sentences, and at four his language differs from that of his parents in style rather than grammar.Recent evidence suggests that an infant is born with the capacity to speak. What is special about man"s brain, compared with that of the monkey, is the complex system which enables a child to connect the sight and feel of, say, a toy bear with the sound pattern "toy-bear". And even more incredible is the young brain"s ability to pick out an order in language from the mixture of sound around him, to analyze, to combine and recombine the parts of a language in new ways.But speech has to be induced, and this depends on interaction between the mother and the child, where the mother recognizes the signals in the child"s babbling, grasping and smiling, and responds to them. Insensitivity of the mother to these signals dulls the interaction because the child gets discouraged and sends out only the obvious signals. Sensitivity to the child"s non-verbal signals is essential to the growth and development of language.
A．have a high IQB．be insensitive to verbal signalsC．be less intelligentD．not necessarily be backward
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一初产妇，26岁，孕足月，出现规律性宫缩一小时候来院。由于宫缩过强未来得及消毒及保护会阴，胎儿即娩出。随后阴道有较多血流出。检查：宫缩良好。采取何措施可预防产后出血（）。
A.胎头娩出后，即可给予催产素，加强宫缩 B.注意保护会阴 C.胎儿娩出后肌内注射催产素 D.胎儿娩出后手取胎盘 E.胎肩娩出后肌内注射催产素
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压力容器的密封方式主要有强制密封、自紧密封。（）
A.对 B.错
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新鲜液体血浆内含有以下哪些物质（）。
A.血浆蛋白、全部的凝血因子
B.血浆蛋白、稳定的凝血因子
C.全部的凝血因子
D.血浆蛋白
E.FⅤ、FⅧ
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真理的绝对性是指______
A．任何真理都是对客观事物及其规律的正确认识，这是无条件的、绝对的
B．人类完全可以认识无限发展的物质世界，这也是无条件的、绝对的
C．无数相对真理的总和构成绝对真理
D．真理从深度上有待于深化
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非对称循环变应力的平均应力的表达式是( )。
A．σ<SUB>m</SUB>=(σ<SUB>max</SUB>-σ<SUB>min</SUB>)/2
B．σ<SUB>m</SUB>=σ<SUB>max</SUB>/2
C．σ<SUB>m</SUB>=(σ<SUB>max</SUB>+σ<SUB>min</SUB>)/2
D．σ<SUB>m</SUB>=0
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在交流电路中，把有功功率与视在功率的比定义为功率因素。()
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{100}在四方晶系中所表示的单形为
A. 平行双面?B. 四方柱C. 立方体D. 四方双锥
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锲而不舍，金石可镂。该典故的作者是（）。
A.老子B.荀子C.庄子D.孔子
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根据我国现行宪法规定，我国实行由( )负责保障宪法实施的体制。
A．司法机关B．立法机关C．专门机关D．行政机关
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采用中国九分法估计该病人的烧伤面积约为（）
A.18％B.21％C.24％D.27％E.54％
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超声波有纵波、横波和表面波三种振态，下列哪项是错误的
A . 在固体中有纵波、横波、表面波B . 在液体和气体中有纵波C . 在真空中有横波和表面波D . 在生物组织中有纵波E . 在人体组织中有纵波
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《中国铁路上海局集团有限公司车站12306旅客服务中心管理办法》（上铁客〔2019〕29号）规定，药箱内的药品、器械使用后，《旅客用药登记簿》上详细记录（）
A.记录药品
B.器械使用情况
C.旅客身份信息
D.使用时间
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