单项选择题
图B1-3为某工程地下室变形缝防水构造设计,试问下图哪个部位设计不当().
A.部位A B.部位B C.部位C D.部位D
A.200mm B.250mm C.300mm D.350mm
A.90~100mm B.120~150mm C.50~70mm D.20~30mm