【单选题】尼龙-66的平均分子量是1.8万,以结构单元表示的聚合度是(已知:尼龙-663 重复单元的分子量是226)
【简答题】己内酰胺以NaOH作引发剂制备尼龙-6 的聚合机理是 ;尼龙66的重复单元是 。
【单选题】Tom is good at Maths so I think he is the student _______ can help you to work out this problem.
【单选题】尼龙610的重复单元是
A.
-NH(CH 2 ) 6 NHCO(CH 2 ) 4 CO-
B.
-NH(CH 2 ) 6 NHCO(CH 2 ) 8 CO-
C.
-NH(CH 2 ) 8 NHCO(CH 2 ) 4 CO-
D.
-NH(CH 2 ) 10 NHCO(CH 2 ) 4 CO-
【单选题】Word中添加批注执行的操作是__________。
【单选题】The reason why coal is still a very valuable source of power is ______atomic power is not available in sufficient quantity.