单项选择题
A.12 B.14 C.16 D.18
A.105-115 B.115-125 C.125-135 D.135-145
A.鲁棉研15 B.鲁棉研16 C.鲁棉研18 D.鲁棉研19
A.3000-3500 B.3500-4000 C.4000-4500 D.4500-5000
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