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单项选择题

消失模铸造适用于哪些材质的浇注( )
A、铝合金
B、铸钢及有色合金
C、各种材质
D、铝、镁合金

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未知题型
Good manners represent our values concerning social stylE.Manners signal our respect for other people and are essential in gaining the acceptance of others. Two-year-old children playing on a slide will stand in line, respecting each other's turn. If an aggressive child crowds in, the 'line' will decide as a group whether to allow it or to shove him out. By the age of 2, a child is already expected by his game-mates to respect the rules of the gamE.And rules, like manners, define the behavior. that others expect from us. A child who is either too aggressive or too retiring to follow the rules is labeled an undesirable by the other children.
单项选择题
在径向均布荷载作用下，三铰拱的合理轴线为（） A.
圆弧线 B.
抛物线 C.
悬链线 D.
正弦曲线
多项选择题
下列选项中不属于企业的战略决策的有()。
A、企业经营目标
B、技术革新方向
C、企业文化
D、企业员工素质
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