正确答案: A
            2 
            题目:油润滑艉轴承的长度应不小于()倍的艉轴直径。
           
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            学习资料的答案和解析:
                                                    
                                 
                
                 [单选题]对商船动力装置的基本要求是()。
                                                
                  
                                                                                                                                                                                                             A+B+C 
                                            
                
                
                            
                
                 [单选题]If the engine does start on air, but combustion does not immediately begin, the cause may not be ().
                                                
                  
                                                                                                                                                                                                             turning gear being still o 
                                            
                
                
                            
                
                 [单选题]In the four-stroke engine, it takes () to make one power stroke.
                                                
                  
                                                                                                                                                                 two revolutions