| Children have been said to have
brain-injured child syndrome, hyperactive (极度活跃的) child syndrome and
attention-deficit disorder (ADD). As early as the 1940’s, psychiatrists have{{U}}
(67) {{/U}}children with hyperactivity and extremely distracted and
impulsive (冲动的). These frequent name changes show how{{U}} (68)
{{/U}}researchers are about the causes{{U}} (69) {{/U}}the problem
and the diagnostic criteria for the disorders. In the past several years, the
people who{{U}} (70) {{/U}}attention deficit hyperactivity disorder
(ADHD) have{{U}} (71) {{/U}}to clarify the disorder’s causes and{{U}}
(72) {{/U}}, and have reasons to believe that it may be genetic.
Today’s view{{U}} (73) {{/U}}this disorder is very different from the
beliefs of just a few years ago. Researchers are finding that ADHD is not a
disorder of just attention, but is A. symbol B. signal C. mark D. sign [多项选择]关于将损失摊入经营成本的说法正确的有（）。
A. 将损失摊入经营成本的方法与现金预算的目标是矛盾的。 B. 经济单位将损失直接摊入经营成本的能力取决于一年当中是否总能保持一个超过其他支出项目的收入余额，或者能否保持十分充裕的可变的基金以克服任何资金的短缺 C. 适合于处理那些损失概率高但损失程度较小的风险 D. 一个经济单位所能吸收的损失或损失积累的规模，同其他日常开支一样，取决于现金流通的余额或赤字加上可变现的准备金或短期借款的额度 E. 将损失摊入经营成本，是指在风险事故发生时，经济单位把意外的损失计入当期损益 [简答题]简述政策系统一般环境中的政治法治环境。
[单选题]下列那种阀门属于最常用的低噪音调节阀( )。
A.直通双座调节阀 B. 套筒多孔分流式 C.角形阀 D.蝶阀 [单选题]煤矿井下照明、信号、电话和手持式电气设备的供电额定电压，不得超过（）V。
A.127 B.220 C.36 [多选题]叉杆立杆所使用的工具包括( )。
A.叉杆 B.葫芦 C.顶板 D.滑板 [单选题]在洛氏硬度HRC为60±2的钢上，混凝土回弹仪的率定值应为（ ）
A.A、80±2 B.B、60±2 C.C、74±2 D.D、78±2 我来回答: 提交
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