單項(xiàng)選擇題
A.1800mm B.2000mm C.2500mm D.3000mm
A.1800mm B.2000mm C.2500mm D.3000mln
A.800mm B.1000mm C.1200mm D.1500mm
A.800mm B.1000mm C.1200mm D.1300mm
A.600mm B.1000mm C.1200mm D.1300mm
A.300mm B.400mm C.500mm D.600mm
A.1000v B.2000v C.3000v D.4000v
A.1級 B.2級 C.3級 D.4級
A.50% B.60% C.70% D.80%
A.針式 B.蝶式 C.懸式 D.拉線