單項(xiàng)選擇題信號設(shè)備應(yīng)先除銹,涂防銹漆,再涂規(guī)定顏色的調(diào)和漆,調(diào)和漆應(yīng)涂()

A.1遍
B.2遍
C.3遍
D.4遍


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