单项选择题

A.1.2m(框长)×1.2m(框宽)×1.2m(框高)
B.0.9m(框长)×0.9m(框宽)×0.6m(框高)
C.0.9m(框长)×0.9m(框宽)×1.2m(框高)
D.0.8m(框长)×0.8m(框宽)×1.8m(框高)