注射螺杆与挤出螺杆有何差异?
参考答案:
①运动方式不同:注射螺杆既能转动又能作轴向移动,而挤出螺杆不作轴向移动②尺寸参数不同:长径比、压缩比、螺槽深度等不同③螺杆头型式不同
_________ rubbish did I throw onto the floor that there was no room for people to get past.
A.So little
B.Too little
C.So much
D.Too much
何谓电能表的倍率?