属于POY的物理指标的有（）。
A、干热收缩率
B、断裂伸长率
C、条干不匀率
D、断裂强度
参考答案：B, C, D
____ no doubt that the Great Wall is one of the wonders of the world. [ ]
A. There is
B. It is
C. There has
D. It is with
某工地取试样卵石520g，烘干质量为510g，其含水率为（）。
A、2.0%
B、3.3%
C、1.9%
D、2.3%
