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气动三联件是（） ["A.气压表","B.油雾器","C.减压阀","D.气管"] 加氢临氢系统停工期间需用（）置换。 ["A、空气","B、氮气","C、水蒸汽","D、氢气"] 枪术的枪法说法错误的一项（） ["拦","拿","扫","扎"] 常用键的种类有：普通（）、半圆键。 ["A、花键","B、平键","C、楔键","D、钩头楔键"] 刀术运动特点（） ["刚柔相济轻快潇洒矫健优美","勇猛快速有力手要圆熟","勇猛快速刚劲有力","劲力适当方法正确拦拿缠绕圆转"] 滚条