A.奇數(shù);奇數(shù) B.奇數(shù);偶數(shù) C.偶數(shù);偶數(shù)
A.擠壓、剪切,擠壓 B.擠壓、剪切,剪切 C.擠壓、剪切,剪切、擠壓
A.都是點(diǎn)接觸 B.都是線接觸 C.既有點(diǎn)接觸也有線接觸