正确答案: C
            流道阻塞 
            题目:增压器喘振的常见原因是()。
           
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                 [单选题]并联连接系统按照部件的连接情况可分为备用部件和基本部件,根据使用情况有()。Ⅰ.固定式连接热态(在负荷下)各用方式;Ⅱ.固定式连接冷态(在无负荷下)各用方式;Ⅲ.不固定式(流动式)连接各用方式
                                                
                  
                                                                                                                                                                                                             Ⅰ+Ⅱ+Ⅲ 
                                            
                
                
                            
                
                 [单选题]柴油机镀铬气缸套正常磨损率应在()mm/kh范围内。
                                                
                  
                                                                                                                                                                 0.01~0.03 
                                                                                        
                
                
                            
                
                 [单选题]防止拉缸的工艺措施主要是()。Ⅰ.保证活塞运动装置的安装精度;Ⅱ.保证活塞运动装置的对中性;Ⅲ.采用波纹加工;Ⅳ.采用精车加工;Ⅴ.采用研磨加工。
                                                
                  
                                                                                                                                                                                                             D.Ⅰ+Ⅱ+Ⅲ 
                                            
                
                
                            
                
                 [单选题]轴系的同轴度不符合要求时,则轴系的()也必然不符合要求。
                                                
                  
                                                                         δ总、φ总 
                                                                                                                                                                                
                
                
                            
                
                 [单选题]Before a marine diesel engine is started the cylinders and pistons must be ().
                                                
                  
                                                                                                                     warmed up gradually to appropriate temperature 
                                                                                                                                    
                
                
                            
                
                 [单选题]The cast iron guide-ways for () are attached to the top section and seal off the crankcase.
                                                
                  
                                                                                                                     the cross-head 
                                                                                                                                    
                
                
                            
                
                 [单选题]The main purpose of the piston oil scraper rings is to ().
                                                
                  
                                                                                                                     reduce the amount of lube oil burned in the combustion chamber 
                                                                                                                                    
                
                
                            
                
                 [单选题]The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing workThis is known as ().
                                                
                  
                                                                                                                     brake horsepower