捻陷的危害?
参考答案:
B点的摩擦力阻止了捻回的传递,顶孔以下(BC段)捻回多,顶孔以上(AB段)捻回少(比应加的少20%~30%),故上段粗纱强力低,易断头。
After a thorough search, the rescue team finally brought the mountain climbers back, __________.
A.safely and soundly
B.safe and sound
C.safely and sound
D.safe and soundly
基内菌丝