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问题 多项选择题

下面关于启用CRC4校验和链路身份识别正确的说法为（）。

A、CRC4在AN和LE两侧需要保持一致，或者都用或者都不用

B、CRC4在AN和LE两侧无需保持一致，或者都用或者都不用

C、链路身份标识规程是V5.2协议中的一个检验2048kbit/s链路是否正常连通的规程，用来防止PCM物理连线交叉接错

D、在每一个2048kbit/s链路上进行检验，若有不正常情况，相关的2048kbit/s链路将被闭塞

答案

参考答案：A, C, D

单项选择题

欧洲历史上最早的系统完备的法律出自于：

A．希腊

B．罗马

C．法国

D．英国
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单项选择题

Watch a baby between six and nine months old, and you will observe the basic concepts of geometry being learned. Once the baby has mastered the idea that space is three-dimensional, it reached out and begins grasping various kinds of objects. It is then, from perhaps nine to fifteen months, that the concepts of sets and numbers are formed. So far, so good. But now an ominous development takes place. The nerve fibers in the brain insulate themselves in such a way that the baby begins to hear sounds very precisely. Soon it picks up language, and it is then brought into direct communication with adults. From this point on, it is usually downhill all the way for mathematics, because the child now becomes exposed to all the nonsense words and beliefs of the community into which it has been so unfortunate as to have been born. Nature having done very well by the child to this point, having permitted it the luxury of thinking for itself for eighteen months, now abandons it to the arbitrary conventions and beliefs of society. But at least the child knows something of geometry and numbers, and it will always retain some memory of the early happy days, no matter what vicissitudes it may suffer later on. The main reservoir of mathematical talent in any society is thus possessed by children who are about two years old, children who have just learned to speak fluently.

Which of the following conclusions is supported by the passage().

A. Preschool education should stress society’s beliefs and conventions.

B. The language concepts used in early education interfere with mathematical reasoning.

C. Language teaching should incorporate some mathematical formulas.

D. It is hopeless to try to teach children mathematics after the age of two.
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