为什么高速纺可采用无导丝盘卷绕?
参考答案:
高速纺纺丝吹风窗下上油→丝束抱成一束→高速行走时与空气摩擦↓→丝束张力↓→解决了无导丝盘卷绕的技术问题,还有毛丝↓、断头↓
He wants to have ________ third cake,because ________ second one is too small.
A.the;the
B.the;a
C.a;the
D.a;a
颈椎的挤压试验机制在于:()
A.使椎间孔舒展
B.使椎间孔缩小
C.减轻对神经根的刺激
D.牵拉椎间孔
E.牵拉肌肉或筋膜