A. 爆破火焰 B. 打斜井灭火 C. 清水压井灭火 D. 前述全部
A. 失电环境 B. 失电制动 C. 得电制动 D. 空气制动
A. the cylinder cover is cracked B. the injector holes is clogged C. the cams are not properly set D. fuel pump is leaking
A. 正确 B. 错误