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【单选题】
下列关于稳定的说法哪种正确（ ）A.
压杆失稳是因为杆中部的应力超过了钢材的强度
B.
压杆失稳是压力使刚度减小并消失的过程
C.
压杆失稳是因为杆件有缺陷
D.
压杆失稳时的形式之一是弯曲
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【简答题】通常,机器与机构称为 __________ 。
【简答题】葡萄糖中重金属的检查:取供试品16.0 g,加水溶解成100 mL,取试液25.0 mL,依药典方法检查,与标准铅溶液2.0 mL(每1 mL相当于10μg的Pb)制成的对照液比较,颜色不得更深,问重金属的限量为多少?
【简答题】在多级放大电路的阻容、变压器、直接三种耦合方式中，（ ）耦合便于集成。
【单选题】One of the central preoccupations of the arts and humanities is the observation of human beings. Painters and sculptors create images of the human form ; writers tell stories or compose poems about hu...
A.
And in our own lives, in our own ways, we spend a great deal of our energy and attention on our fellow creatures, being in families and other kinds of relationship, observing people with curiosity and interest in the course of the day, thinking about and forming our own character — deciding what kind of person we wish to be — as we grow.
B.
One of the central preoccupations of the arts and humanities is the observation of human beings.
C.
Painters and sculptors create images of the human form ； writers tell stories or compose poems about human experience; musical artists give melodic contours to the human spirit; historians and philosophers ponder the essential qualities of human civilization and nature.
【简答题】( )是施工定额采用的定额水平。 A平均先进水平 B社会平均水平 C企业先进水平 D企业平均水平
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