单项选择题
A.Φ177.8mm B.Φ203mm C.Φ228.4mm D.279.44mm
A.l0mm B.30mm C.50mm D.70mm
A.吊卡 B.卡瓦 C.安全卡瓦 D.液压大钳
A.88.9一298.5mm B.100一300mm C.200一300mm D.100一200mm
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