JT-C系列机车信号运用于微电子交流计数区段，信号显示的应变时间为（）.

A.不大于5s

B.不大于7s

C.3.2～5s

D.大于7s

Being a parent is not always easy, and being the parent of a child with special needs often carries

with ______ extra stress. [ ]

A. it

B. that

C. him

D. one