题目：
胶带防腐时，管子表面必须认真清理，喷射除锈时应达到Sa2级；如条件不具备，可采用手工除锈，应达到St3级。
答案：
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参考答案：A, B, C
胶带防腐时，管子表面必须认真清理，喷射除锈时应达到Sa2级；如条件不具备，可采用手工
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