| Play is the principal business of
childhood, and more and more in recent years research has shown the great
importance of play in the development of a human being. From earliest infancy,
every child needs opportunity and the right material for play, and the
main tools of play are toys. Their main function is to suggest, encourage and
assist play. To succeed in this they must be good toys, which children will play
often, and will come back to again and again. Therefore it is important to
choose suitable toys for different stages of a child’ s development. In recent years’ research on infant development has shown the standard a child is likely to reach, within the range of his inherited abilities, is largely determined in the first three years of his life. So a baby’s ability to profit from the right play materials should A. helping children to play B. urging children to play C. recommending ways for children to play D. asking children to play [判断题]岸桥一个正常俯仰工作循环,一般需耗时20分钟左右。( )
A.正确 B.错误 [判断题]敦煌石窟是世界上现存规模最大的佛教艺术宝库，已列入《世界遗产名录》，尤以唐代壁画艺术著称于世。( )
[单项选择]每片悬式绝缘子的绝缘电阻不应低于（）MΩ。
A. 100 B. 200 C. 300 D. 400 [单项选择]下列关于中药浸提溶剂的陈述，错误的是（）
A. 浸提溶剂应最大限度地浸提出有效成分 B. 用水煎煮中药，也会煎出脂溶性成分 C. 高浓度乙醇能够浸出较多的强极性成分 D. 溶剂中加入表面活性剂能提高浸出效率 E. 浸提效果与浸提时间有关 [单项选择]对于火灾危险性较高的场所及一些高大的厂房里，适于安装( )灭火系统。
A. 自动喷水干湿两用 B. 自动喷水雨淋 C. 自动喷水预作用 D. 水幕系统 [单选题]下列( )的爆炸属于化学爆炸。
A.汽油桶 B.气体钢瓶 C.蒸汽锅炉 D.可燃气体 [判断题]银行对账单、银行存款余额调节表保管期限为10年。
A.正确 B.错误 [单选题]焦炉煤气中含有一些未被回收的焦油和萘等物质，这些物质在温度低的时候会冷凝下来堵塞煤气管道及设备，为此用焦炉煤气加热时要进行预热，其预热温度一般为( )。
A. 30℃左右 B. 40℃-50左右 C. 55℃左右 D. 60℃左右 [单项选择]ENG VALVE CLOSED灯熄灭，意味着（）
A. 活门开 B. 活门关 C. 活门在转换位 D. 活门故障 [填空题]>钢坯的缺陷可分为( )和内部缺陷。
[单选题]《广西电网有限责任公司电气操作票管理业务指导书》第5.1.6条：监护人、操作人员连续（ ）没有从事电气倒闸操作相关工作的，应经考试认证合格后方可重新从事相应工作。
A.三个月 B.半年 C.九个月 D.一年 [单选题]08-32捣固车电子摆外接电源为()。
A.±5V B.±10V C.±15V D.±24V [单选题]细目照相中被拍摄主体应不小于画面的( )。
A.3/4 B.1/3 C.2/3 D.1/2 [单项选择]
A. around B. about C. on D. of [单选题]修整石块时，应戴（ ），两人不得对面操作。在脚手架上砌石不得使用大锤。
A.安全帽 B.防护眼镜 C.耳塞 D.口罩 我来回答: 提交
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