A.極數(shù)多而轉(zhuǎn)速低 B.極數(shù)少而轉(zhuǎn)速低 C.極數(shù)少而轉(zhuǎn)速高 D.極數(shù)多而轉(zhuǎn)速高
A.橢圓柱形 B.四棱柱形 C.圓柱形 D.三棱柱形
A.0.5~1mm B.1~2mm C.2~2.5mm D.2.5~4mm