单项选择题
A.2m B.5m C.8m D.l0m
A.公锥 B.滑块 C.可退打捞矛 D.卡瓦打捞筒、带引鞋的滑块卡瓦打捞矛或可退打捞矛
A.2 B.3 C.5 D.10
A.98mm B.105mm C.114mm D.116mm
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