A.3℃ B.5℃ C.10℃ D.15℃
A.0.1mm<低塌<0.2mm B.0.2mm<低塌<0.3mm C.0.2mm<低塌<0.4mm D.0.2mm<低塌<0.6mm
A.0.3mm B.0.4mm C.0.5mm D.0.6mm