A.跑車(chē)防護(hù)裝置 B.阻車(chē)器 C.擋車(chē)欄 D.勾車(chē)器
A.10 B.20 C.30 D.40
A.1 B.2 C.3 D.4
A.50mm B.100mm C.200mm D.300mm