前囟最大的时间为
A.出生时
B.8周
C.6个月
D.8个月
E.12个月
参考答案:C
What is the main reason to slush a wire rope?()
A.Keep the wire soft and manageable
B.Lubricate the inner wires and prevent wear
C.Prevent kinking
D.Prevent rotting
环境认知