单项选择题
A.空行程B.压紧C.连续打击D.单次打击
A.3tB.5tC.10tD.16t
A.200-250B.250-300C.300-350D.350-400
A.1/3-1/2B.1/2-2/3C.2/3-3/4D.3/4-4/5
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