单项选择题

A.加密区长度/箍筋加密区间距向上取整加1
B.[(加密区长度-50)/箍筋加密区间距向上取整减1]*2
C.[(加密区长度-50)/箍筋加密区间距向上取整]
D.[(加密区长度-50)/箍筋加密区间距向上取整加1]*2