搜题请搜索小程序“爱下问搜题”
问题 单项选择题

炸药中( )是我国矿山最广泛使用的工业炸药。

A．硝酸铵类炸药

B．硝化甘油炸药

C．乳化炸药

D．水胶炸药

答案

参考答案：A

解析：炸药一般有硝酸铵类炸药、水胶炸药、硝化甘油炸药和乳胶炸药。其中硝酸铵类炸药是我国矿山最广泛使用的工业炸药。硝酸铵类炸药曾称“硝氨炸药”或“硝铵炸药”，以硝酸铵为主加有可燃剂或再加敏化剂(硝化甘油除外)。可用雷管起爆的称为混合炸药。

单项选择题

What’s your earliest childhood memory Can you remember learning to walk Or talk The first time you heard thunder or watched a television program Adults seldom (1) events much earlier than the year or so before entering school, (2) children younger than three or four (3) retain any specific, personal experiences.

A variety of explanations have been (4) by psychologists for this "childhood amnesia". One argues that the hippo-campus; the region of the brain which is (5) for forming memories, does not mature until about the age of two. But the most popular theory (6) that, since adults don’t think like children, they cannot (7) childhood memories. Adults think in words, and their life memories are like stories or (8) one event follows (9) as in a novel or film. But when they search through their mental (10) for early childhood memories to add to this verbal life story, they don’t find any that fit the (11) . It’s like trying to find a Chinese word in an English dictionary.

Now psychologist Annette Simms of the New York State University offers a new (12) for childhood amnesia. She argues that there simply aren’t any early childhood memories to (13) . According to Dr. Simms, children need to learn to use someone else’s spoken description of their personal (14) in order to turn their own short-term, quickly forgotten (15) of them into long-term memories. In other (16) , children have to talk about their experiences and hear others talk about (17) --Mother talking about the afternoon (18) looking for seashells at the beach or Dad asking them about their day at Ocean Park. Without this (19) reinforcement, says Dr. Simms, children cannot form (20) memories of their personal experiences.

Notes: childhood amnesia 儿童失忆症。

15（）

A.impressions

B.beliefs

C.minds

D.insights
查看答案
单项选择题

对于企业管理者而言，数据挖掘的核心目标在于（）

A.业务应用

B.数据分析

C.总结报表

D.技术验证
查看答案