通常情况下，同轴度调整所用的工具有（）。 A.刀口尺 B.水平仪 C.螺旋测微仪 D

只列式，不计算。

在两根相距50米的电线杆之间挖树坑，每隔5米挖一个，一共要挖多少个树坑？

污水处理后达标排放是石化企业的职责和义务，影响炼油工业废水产生和排放主要因素有（）

A、原油的组成

B、加工流程

C、加工规模

D、生产管理

19世纪末，桓台县苗世厚四兄弟在济南泺口经营粮食贸易，很快形成资金逾万的苗氏集团。这一时期苗氏集团得以发展的主要原因是（）

A.清政府放宽对民间设厂的限制

B.外商企业和洋务企业的刺激

C.列强放松对中国的经济侵略

D.民国政府的鼓励与推动

领导干部经济责任审计评价为‚较好‛的，按照规定应当如何运用（）

A、取消本年度表彰奖励资格

B、组织谈话，限期改正

C、不影响提拔使用和表彰奖励

D、调整交流

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.