| 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 reaches
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 A. Picking up a wooden block. B. Recognizing the number 2. C. Uttering a nonsense word. D. Looking at distant objects. [单选题]当心脏收缩时，动脉内的压力最高，此时压力称为
A.动脉血压 B.舒张压 C.收缩压 D.静脉压 [判断题]驾驶机动车在上道路行驶前驾驶人要按规定系好安全带。
A.正确 B.错误 [多选题]平面连杆机构是由一些刚性构件用()相互连接而组成的机构。
A.转动副 B.移动副 C.固定副 D.偏移副 E.以上都是 [多选题]应急预案的演练频次基于哪些因素确定？（ ）。
A.风险大小 B.预案成熟度 C.员工掌握程度 D.应急物资储备情况 [简答题]呼吸阀作用是什么？
[判断题]2.24 GB1589-2016中,自卸式货车包括栏板式自卸货车、平板式自卸货车和厢式自卸货车等。
A.正确 B.错误 [判断题]从常温状态开始，混凝土随着受热温度的不断升高，其强度只会下降。
A.正确 B.错误 [单选题]进站信号机应设在距进站最外方道岔尖轨尖端(顺向为警冲标)不少于( )的地点,如因调车作业或制动距离的需要,一般不超过400m。
A.200m B.150m C.100m D.50m [单选题]使用外接电源给电瓶充电时，电瓶按钮需置于：
A.按入位 B.OFF位 C.无论按钮在何位置，均可充电 [简答题]用CR-39固体径迹探测器测量居室内氡浓度时，将探测器布放在测量现场暴露20d，经蚀刻处理后用显微镜测出单位面积上的径迹数为65530径迹／cm2，已知该探测器的刻度系数为4.2径迹／cm2／Bq•h／m3，试计算所测居室内的氡浓度。
[单项选择]2010年3月31日，正式宣布解散的国际组织是（）
A. 西欧联盟 B. 北大西洋公约组织 C. 裁军谈判会议 D. 华沙条约组织 [单项选择] {{B}}Passage One{{/B}}
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