A.傾斜,不穩(wěn)定、不堅(jiān)固的場(chǎng)所B.浴室等潮濕場(chǎng)所C.高溫物體上方D.火爐、煤氣及排氣筒等物體正上方
A.3號(hào)B.5號(hào)C.7號(hào)