单项选择题
A.1.5% B.2% C.2.5% D.3%
A.1.3 B.1.5 C.1.8 D.2.0
A.0.67 B.0.76 C.0.80 D.0.85
A.暗敷设 B.半暗敷设 C.明敷设 D.半明敷设
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