— I'm terribly sorry to have put you through so much trouble.  

— ________. I know you didn't mean to. [      ]

A. Forget about it  

B. No trouble

C. All right  

D. You're welcome

高速电气化接触网使用的吊弦为整体吊弦，而整体吊弦预制长度允许偏差为（）mm。