21. Which of the following ropes is a synthetic-fibre rope?
(A) Manila rope.
(B) Sisal rope.
(C) Hemp rope.
(D) Polypropylene rope.
答案:登入後查看
統計: A(108), B(39), C(102), D(450), E(0) #2679240
統計: A(108), B(39), C(102), D(450), E(0) #2679240