K4/553/523天窗类型分别为：（）1.Bottom-loadandouter-sliding；2.Top-loadandouter-sliding；3.Bottom-loadandinner-sliding；4.Top-loadandinner-sliding
K4/553/523天窗类型分别为：（）1.Bottom-loadandouter-sliding；2.Top-loadandouter-sliding；3.Bottom-loadandinner-sliding；4.Top-loadandinner-sliding
A.123；
B.312；(正确答案)
C.234；
D.432；