单项选择题
A.1/2 B.1/3 C.1/4 D.1/5
A.15%~20%B.20%~25%C.25%~30%D.30%~35%
A.50cm B.55cm C.60cm D.65cm
A.3/4 B.3/5 C.1/2 D.2/5
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