A. 1969 B. 1970 C. 1971 D. 1972
A. 正确 B. 错误
A. 对比分析法 B. 因素分析法 C. 数理统计分析法 D. 常规分析法
A. the sinking of tail shaft B. the clearance of stern bearing C. the total flexure of both end bearing D. main engine crankshaft deflectio