单项选择题
A.2-3扣 B.5-6扣 C.7-8扣 D.9-10扣
A.1-2扣 B.2-3扣 C.3-4扣 D.4-5扣
A.15s B.30s C.45s D.60s
A.15° B.30° C.45° D.60°
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