由于舌针的( )，可以同时垫入多根纱线，故适宜于多梳栉经编机。另外，舌针适用于加工短纤维纱。
A、垫纱口大
B、垫纱口小
C、针杆长

单项选择题The Vietnam War was a long-time suffering for Americans, and its continued throughout the terms of president___.A.Johnson, Nixon and FordB.Truman, Eisenhower and KennedyC.Kennedy, Johnson and NixonD.Eisenhower, Kennedy and Johnson

单项选择题文字旋转角度顺时针为正值 A、正确 B、错误