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【多选题】
观察铁路1号站舍的楼板层照片,该楼板处出现的裂缝属于什么情况,可以采取什么措施?请将所有正确的说法出来。A.
该裂缝必须采用注浆封闭grouting closure处理，注浆材料可采用环氧、聚氨酯、氰凝、丙凝等。
B.
该裂缝的位置不接触水，可采用注浆封闭，也可以采用聚合物砂浆粉刷或其他表面封闭材料进行封闭。
C.
无论是采用环氧、聚氨酯、氰凝、丙凝中的哪一种注浆封闭方法，封闭裂缝这个操作步骤。
D.
环氧注浆是最复杂的一种注浆封闭方式，需要采用带颜色的水试灌，检查封闭情况，并观察各是否畅通，如无漏水情况，灌注。
E.
氰凝毒性较大，操作人员必须配戴防护镜、口罩和胶皮手套，同时应注意防火。
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