A.1∶1.2; B.1∶1.5; C.1∶1.75; D.1∶2.0。
A.75mm配30mm木螺釘; B.75mm配35mm木螺釘; C.100mm配30mm木螺釘; D.100mm配35mm木螺釘。
A.4 B.5 C.6 D.7