A.4-5個(gè)立桿間距或5-7m B.6-8個(gè)立桿間距或7-9m C.8-10個(gè)立桿間距或8-10m D.2—4個(gè)立桿間距或2~4m
A.50mm B.100mm C.150mm D.200mm
A.150 B.120 C.110 D.100