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【简答题】
劳动合同的必备条款有哪些（ ）。
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【单选题】For the columns with the same length, material, constraint conditions and cross-sectional area, etc., the stability of which kind of shape of cross-section (see the following figures)is best ? . And t...
A.
(A) (C)
B.
(B) (D)
C.
(C) (A)
D.
(D) (B)
【单选题】In the case that the cross-sectional area, support conditions, materials and other conditions are all the same for columns, which kind of cross-sectional shape shown in the figure will get the best st...
A.
（1）
B.
（2）
C.
（3）
D.
（4）
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