单项选择题
A.50x20B.10x20C.20x30D.25x30
A.20x20B.100x20C.50x10D.40x15
A.气压B.热压C.油压D.冷压
A.0.1~0.2B.0.2~0.3C.0.6~0.8D.0.9~1.2
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