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【多选题】
必须实施见证取样和送检的试块、试件和材料的有( ) 。A.
用于承重结构的混凝土试块
B.
用于承重墙体的砌筑砂浆试块
C.
用于承重 结构 的钢筋及连接头试件
D.
所有 的 水泥材料
拍照语音搜题，微信中搜索"皮皮学"使用
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