单项选择题
A.1/3~1/2 B.1/4~1/3 C.1/5~1/4 D.1/6~1/4
A.40° B.45° C.50° D.55°
A.15° B.20° C.25° D.30°
A.扁平 B.随意 C.很短 D.较短
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