一个长方体切割成两个小正方体，长方体和两个小正方体[ ]
A．体积相等
B．表面积相等
C．棱长之和相等
答案：A
-- Who broke the glass?
-- I suppose _____ must be one of the children.
A．the one
B．he
C．it
D．who
无菌室空气压力开关的功能（）。
