A.TN-S
B.TN-C
C.TT
D.IT
A.0.5mx0.6m
B.0.4mx0.5m
C.0.4mx0.6m
D.0.5mx0.5m
A.0.5mx0.6mx1.0m
B.0.5mx0.6mx0.8m
C.0.4mx0.5mx0.6m
D.0.6mx0.8mx1.0m
A.10mm
B.50mm
C.150mm
D.80mm
A.10
B.30
C.50
D.60
A.额定速度大于0.63m/s的电梯
B.额定速度为lm/s的电梯
C.额定速度不大于lm/s的电梯
D.额定速度大于lm/s的电梯