单项选择题
A.51.25D B.48.75D C.52.75D D.54.25D
A.60 B.80 C.100 D.120
A.8D B.9D C.10D D.11D
A.收缩;凸起 B.收缩;扁平 C.放松;凸起 D.放松;扁平
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