A. dilutes the lube oil and reduces its viscosity B. forms sulfuric acid in the lube oil C. causes pitting and failure of the bearings D. causes sludge deposits on valve stem
A. 正确 B. 错误
A. 2 B. 4 C. 6 D. 8
A. 战略性情报 B. 操作性情报 C. 战术性情报 D. 全局性情报