题目内容
（请给出正确答案）
[主观题]
The strength of a thermoplastic polymer such as polyethylene tends to increase after uniaxial deform
ation, because______.
A．cross linking occurs during deformation
B．oxidation occurs during deformation in air at room temperature
C．polymer chains tend to align themselves with the chain axis oriented along the direction of deformation
D．none of the above
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