单项选择题
A.7000LB.8000LC.9000LD.10000L
A.1个B.2个C.3个D.4个
A.1000VB.1100VC.1200VD.1300V
A.小于等于0.5mmB.小于等于1.0mmC.大于等于5.5mmD.小于等于2.0mm
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